brakes requested to be changed was told by service mechanic that they were fine don't need replacing now. No upcharge, very honest shop. All work done outstanding and conpleted when promised. Full service shop specializes in Japanese cars but will repair all brands. read more

I have been taking my truck to this shop for over a year and only thing that I found about this shop is very honest and careful yet quick. Also top of all, honest pricing. My previous mechanics weren't this honest and one gave fatal damages and another one is charging extremely high charges for no reasons. I was playing not noticing that but I started to bring my truck every little things and I feel very safe driving my truck more than ever. Thank you Yoshi and you are amazing mechanic as my friend referred. read more

was recommended this shop for anything mazda related! installed an lsd, quick, responsive, and trustworthy! will take my miata to him from now on! read more

This is the first time I've encountered such an honest car repair shop. Every time I go, I feel very happy, and they explain everything in detail, making it very easy to understand. I've learned a lot about cars here that I didn't know before. The prices are reasonable, and the people who do the repairs are understanding of my lacking experience as well. read more

For anyone that owns an RX8, RX7 or any rotary engine vehicle, you know how hard it is to find a good mechanic that knows how to work on these cars. My RX8 started to leak coolant from the radiator so I was in desperate need to get it fixed asap. The dealership quoted me $1200 parts and labor to replace the radiator. I found Neptune's Speed on a RX8 forum and it was highly recommended so I decided to give them a call. Yoshi responded to my voice message the same day and quoted me about half the cost of the dealership. I made an appointment for the following week. While I was waiting, Yoshi mentioned a few issues he found. The engine mounts were done and also my serpentine belt was worn. He asked me if my car shook a lot while driving so he definitely knew what he was talking about. The total cost for all the repairs came out to $1600. He even replaced one of my low beam light bulbs for free. Not exactly cheap, but compared to the dealership who wanted to charge me $1200 just for the radiator, this is a steal. When I got my car back, there was no more shaking and because he replaced the serpentine belt, no more squeaking noise either. My car ran and sounded like-new! Yoshi also asked if there were any issues with my temperature knob for the AC in which I replied yes. I've taken it to a few mechanics and they did not know what the issue was. Yoshi informed me right away that there were some wires behind the console that were loose and needed to be soldered. It would take about 2 hours and roughly $300. Fast forward a few months, I completely broke my AC on/off knob so I decided to take my car back to Neptune's to get that fixed as well as the temperature control. $400 fixed it and it's running like new again. If you own a rotary engine, I highly recommend Yoshi. He's extremely knowledgeable, professional and nice guy. read more

Master Yoshi knows how to spin your rotors and turbos. Some say he charges too much. I say you get what you pay for even if he really does charge a lot. He's done racing before. I've raced my car throughout the years. He's definitely one of the very few mechanics I could fully trust at the track. Highly recommended. read more

Great service. Brought my MR-S here to install some parts and other maintenance. Yoshiya-san is super easy to work with and for such a great price. Another mechanic tried to charge me $500+ to change my valve cover gasket, timing chain tensioner, and belts. Yoshiya-san charged a little over $400 for that plus installing some performance parts. Japanese have a lot of passion for their craft and there's a reason they have 5 stars. I will bring my RX8 soon. Osu! read more

Been coming to Neptune Speed since 2014 for maintenance, installing parts and other reasons on my Mazda RX-8. The owner, Yoshi, is an expert on rotary cars. He's very friendly and his service is great. I trust him with my car and feel like he cares about my car as much as I do. read more

When finding the right expert for your car, you not only want the honesty and transparency but also the integrity of high quality work. Yoshi tells you exactly what your car needs and what it doesn't need and gets the job done. That peace of mind goes a long way when your life depends on the dependability of your car. I highly recommend Neptune Speed for those that want the same for theirs. read more

Brought me Evo X to Yoshiya, having an idle issue for a while and had other shops just scan and run away from it. Yoshi had my car for a day, diagnosed and fixed the issue for a lot less money than I would have expected, even though no parts were replaced. While my evo had full built ons and already tuned, he didn't shy away from the job. He quickly and for an exceptional price had my car back in the road the next day. My go to shop from now on for service and general repairs as my Evo tuning shop is out of the way and always busy. Thank you Neptune Speed! read more

I'll admit that having a vagina comes in VERY handy sometimes... (You ladies know what I mean!!!) People yield for us in a busy intersection, offer to let you go ahead of them in a long line, some give up their seats on a busy bus or subway.... and some of you... like me... have talked your way out of a traffic ticket by playing the sweet innocent "Huh? Wha? There was a red light WHERE?" card. But when your car breaks down and you need to get it repaired, being a woman is possibly the worst possible senario. You're basically a walking target entering a man's world saying "I don't know $*%& about cars, please charge me whatever you wish". But there is a reason Neptune Speed gets 5 stars on yelp. Yoshi is like the older brother I wish I had. Polite, honest, and goes out of his way to make sure you don't get ripped off by the scary world of car mechanics. His pricing is very fair, seeks out the best parts for your car, and your car is ready when he says it will be... he and his co-worker work at "Neptune Speed" because I've never had to wait more than 2 days to get my car back. Yoshi has saved me a ton of money getting my brakes repaired, my fuel pump exchanged among others.... in addition, rather than telling me "Your check engine light is on and it will be $250 for (JUST) a diagnostic test" like every dealership I've been to... he went ahead and did it for me anyway, didn't charge me a dime, and flat out told me... "Yeah, the check light is on because of a small problem with the oxygen emission sensor and it's totally worthless to get it fixed so don't worry about that". I mean ..... talk about lookin' out! Thanks Yoshi! You's my bro' for realz! :) read more

This guy is amazing. I have a Mazda rx-8 and it has given me so much trouble. When it was under warranty I would take it to the Hb Mazda dealership and it seemed like it would be there at least once a month. Since warranty has run out I've taken my car here 2 in the past 2 years and never had any trouble with the quality or price of the work. Great shop, not that expensive and quality work. I can not state how much I appreciate this shop. read more

I have been searching for years and years to find a mechanic that knows what he is doing and is trust worthy. I have driven all over Orange County attempting to find bargains in Santa Ana and Westminster. Pretty much everyone I went to I left with the feeling that I was cheated, which I was! I found Neptune Speed on yelp! and thanks to them my search is finally over. Yoshiya is a great, honest, polite, and kind mechanic. I brought my car in the an O2 sensor and engine service; he was kind enough to point out that my previous mechanic in Costa Mesa modified my starter and did not do a good job! The prices were reasonable, but I will gladly pay more for the feeling that I was taken care of. He leaves the old parts in the car in the box of the new parts, so you know what your getting. Appointments are necessary which makes it easier for both of us, Neptune Speed takes time and care for your car. You will not be dissatisfied. read more

Great service, very helpful and honest mechanic. I took my RX-7 here for PowerFC tuning, and Yoshi really knows his stuff. Both he and Ken are really friendly, helpful and knowledgeable guys for cars in general, but especially for performance vehicles and RX-7s. They've got a few rotaries around the shop, and seem to be really open to just chatting if they've got the time. The shop is well stocked (3 lifts), well maintained, and quite tidy. Ken told me how particular they are in the shop, when doing work like engine rebuilds. Yoshi and Ken are exactly the type of people I'd want working on my car - meticulous and honest. The bottom line is that I'll be back when I need further work done on my rotary. read more

This was the best and most pleasant Autoshop experience of my life. I found Neptune Speed on Yelp out of necessity by being screwed over by another mechanic. I was so beyond frustrated and disenchanted with mechanics. The previous mechanic and charged me $1200 when they had quoted me $500 and broke more of my car including the part that I had paid for them to fix. I had never actually used Yelp before but desperate times call for desperate measures. Neptune Speed seemed to have the highest reviews within my area so I figured I'd give them a shot. Once I called them I realized that they specialize in much nicer performance cars than my average PT cruiser and that they were booked practically a month in advance. Despite not being the type of cars they prefer they kindly obliged me. We scheduled an appointment and I brought my car to them. They quickly identified the problem and were extremely pleasant and professional to talk with. Still being weary of mechanics after my horrible experience I expressed my dissatisfaction with the previous mechanic. They fixed my car extremely quickly and even walked me through where and physically how the other mechanic had broken my car. Including giving me the parts I had paid the last mechanic to replace which I had to pay Neptune to re-replace. On a personal level. These guys are just good men. I ran into one of them almost a year later randomly at the post office and he approached me, remembered me by name and the exact make, color, and problem with my blue PR cruiser. This alone would be reason enough for me to go back. On a professional level. It's been a year and a half and what they fixed has not acted up ONCE! For more details about what was wrong with my car read my negative 1star review of "Ervin Auto" I STRONGLY recommend Neptune Auto again anytime and I plan on going in soon to get my car checked by them again!!!! read more

I had issue with my spark plugs not being properly set and I could not boost properly, friend reminded me to ask yoshi and went by and took care of me and gets it done properly! Told him when other parts come in my ms6 will be even better !! read more

So happy to find a place like this. Been in the area for awhile now and finally found an honest and great mechanic. Yoshi is the man! Always willing to explain what's going on with your vehicle, and does a great job with repairs. He is speedy in his work but does everything with precise accuracy. Really appreciate the time he takes to explain things and let's you know what is needed for the repair. He is very knowledgeable with Mazda's. Never had an issue with scheduling, and he is always flexible and willing to fit me his where he can. Would recommend highly coming here whether you just need a simple oil change/repair or if you're looking to add some performance to your vehicle. read more

Back again to get the oil changed in the truck. The guys were fast, clean, and thorough. I wanted to put a higher grade oil in since the truck is 11 years old, but I was told it would be expensive and that it wasn't necessary since the mileage on the truck is so low and the engine is in very good condition. Saved me $15. :) Honest. Friendly. Quality work. I REALLY wish they worked on bikes. Haha. Thanks again, Neptune! read more

The painful experiences of taking my car to a mechanic are finally over! I have never seen an organized and honest auto shop like Neptune. I took my Toyota Prius there for a 60mile regular check up and they charged me a very fair amount, did a great job. Second time my boyfriend took a car there for inspection as we wanted to buy it from craigslist and get an inspection beforehand. He was very helpful and thorough and initially he quoted $20 for the whole 30 minutes inspection. At the end he didn't charge us anything, because we ended up not buying the car. I want to give a big shout out for this place and a thumbs up for their customer service. read more

Neptune Speed has earned my business for LIFE! I first heard of Neptune Speed from a friend 4 years ago and have been using them exclusively ever since. The owner Yoshiya is the first HONEST and trust worthy mechanic I have met and does exceptional work. This man is a perfectionist and takes pride in ensuring the job is done right the first time at an honest price. I've taken my RX-8 to his shop for regular maintenance, dyno tuning, modification upgrades and everything in between. This isn't JUST a rotary shop though, these guys do excellent work on all makes / models. I've taken my BMW there, my GF's Toyota, and have referred several friends. If anyone in OC is looking for a great & knowledgable shop for your car, look no further because Neptune Speed is where you want to go. read more

Taken my car here twice, and both times I've left satisfied. Price is right and the owner is both knowledgable and friendly. Just purchased another car and I know that should anything arise that I can't fix myself, this is the first place I'll turn! read more

Having relocated to Huntington Beach recently, I needed to find a fair, reliable place to have my 2004 Mini Cooper serviced. My brake pad light came on and I immediately went to Yelp for help! They were great! And less than I expected. I sent my bf over to have his Lexus driver side window fix - it was starting to fall off the track and making a bad noise when he would roll it up. Really frightening. It was $80 and not the $1200 that he would have paid if he went to the Lexus dealer. read more

Took my precious car into Neptune Speed for an oil change. Ever since a fall out with the dealership I have been searching for a trustworthy place to get my car serviced and tuned. Yoshiya and Yu were both excellent, honest and straight forward. Having my car serviced here is so much more present than other auto shops. There is no pressure, you don't have to be on guard, no tricks, and no sales pitch. Their price is much more reasonable as well compared to most other shops I called. I am very glad to have found Neptune Speed. I'll be bringing my other vehicles to them in the future as well. I had an oil change done there the other day and Yoshiya and Yui recommended this synthetic oil they said yields good results. I forgot the brand name but my God it made a huge difference in the smoothness of the engine right after the oil change. "Your car might feel alittle smoother after a couple of days" is a huge understatement. haha, feels like my car got a huge engine tune up just from an oil change. (and I have been using Mobil 1 for ages) Two thumbs up for Neptune Speed. :) read more

Knowledgeable, trust-worthy, honest mechanic. And really, isn't that what you're looking for when your car suddenly stops working? I had my old Civic repaired there 3 times, and each time the mechanic would tell me exactly what he thought was wrong, and then give me options as to what I could do. He even saved me money when he asked if I wanted to use a refurbished part instead of a new part. And the best part... every repair was spot on. Bottom line, this guy knows what he is doing, and doesn't gauge you to get there. Flat out the only guy I would trust my Honda to repair (besides the dealer). read more

Read the reviews here on Yelp before coming in so already managed some expectations. At the end of the day (or in this case, night!), Neptune far exceeded them. Here goes my first review... I was buying a used car from a private owner and took it in here for inspection by Yoshi before making the deal so as to get a professional overview of the car and an impartial opinion as a whole. We arrived a little late (after 6:00) but he still took me in. Everything the owner talked about the car matched up with what Yoshi explained and then some after he personally test drove it as well. He noticed a few minor problems when the car was jacked and elaborated upon them in honest fashion. No high pressure sales tactics to get me to fix it right then and there. A friendly estimate of things to fix and an amazing $5 off "First Time Customer" discount (honestly... what mechanic do you know does something like this?) was applied on my receipt. Since I arrived so late I just gave it back as tip since the inspection was $20 anyways. Plus, it helped me during negotiations (which went on for another hour all in Yoshi's shop) with more counter-points to add from what he found wrong with the car as I bought the car almost $1000 less than what the owner originally listed. Thanks, Yoshi. Will be going back to Neptune for everything related to my car. Future maintenance work (just tire alignment which he'll charge $40 for... others want $60), oil changes and everything in between. Even the seller said the same. P.S. He owns a SICK RX-7. Just saying. read more

Having relocated to HB, I needed a new mechanic. After reading all the reviews on here, I decided to check this place out. Like others, I'm skeptical going to new auto places. I figure I'd start off with an oil change and check up to see how it goes. They were great. Quick and friendly service. The guy (I'm assuming owner) was very friendly and helpful. He checked on my car and informed me of the problems I had, how much it would cost and how long it would take. Prices are very reasonable. He saw that I was a first time customer and even gave me a discount! Definitely taking my car back to get it serviced, as soon as I am not so lazy. :P read more

Honest Trustworthly Honest Accomodating Honest Honest Need I say more? David was extremely friendly and accommodating. I scheduled a Saturday appointment a month in advance for new F/R pads on my S2000. A few days before the appointment, I found a great deal on a Mugen header and asked him if he could fit it in the same time slot. He said NO PROBLEM! I also asked if he could install a 4-point front strut bar and rear lower tie bar. I dropped off the car first thing Saturday morning and (a little nervous) handed over the keys to my pristine low mileage S2000. I got a call later in the afternoon from David telling me that the header and brakes were almost done, but he could not fit in the install of the bars. No problem. I came by to pick up the car and after paying, was on my way. It's so difficult to find a shop that you trust, mechanics that are just honest down-to-earth, yet knowledgeable and capable of the job, but this IS THE shop. I would not trust anyone else, aside from myself, with my 2000 S2000 with 30k miles on the clock - all OEM aside from the Mugen header. Highly recommended shop. Did I mention they were honest? read more

Definitely THE best / honest if not the only mechanic i'd go to I go there whenever I get an oil change or need some work done on my rx-8 if im not able to do it, he even gives a first time customer discount which i found really funny and awesome at the same time (awesome!) he also does a free CEL diagnosis! short story, when i first had my 8 I had a misfire on the 2nd rotor and he even took the time to get fresh ignition coils for me and put them in my car to see if that was the problem, turns out it was the spark plugs and even then he didnt charge me for the labor for the ignition coils (what an awesome guy!) all that im trying to say is, if your looking for a top shelf mechanic and who won't lie to you, Yoshi is the man to go to! read more

Here's my story please take a minute to read this before going here. I bought an rx7 back in May and I was told by my buddy that Yoshi is very good with rotary and honest. I thought I find the right person to trust to work on my car. I brought the car in September for Yoshi to work on hoping that he would do a good job making the car run again and back on the road. Then, I was told that the car has low compression and needs to rebuild. He also sent me pictures of compression test that he ran too. I trusted the guy because of his reputation and honesty. But after all, it was just a lie. I recently sold my car for cheap thinking that it has low compression and the car need a rebuild. At the time, I don't have enough money to do the rebuild so I decided to sell the car instead, but it turns out that my car has very good compression 100+. I was told by the new owner of my rx7 that the car just has a bad oil pump and he sent me a video recording the car crank. I was very disappointed that I put so much money into the car but the mechanic that I trusted screwed me over me over big time. I talked to Yoshi about this and he told me that his compression tester is the problem and told me he was sorry. His SORRY cost me my CAR, MONEY and TIME. I never had to rate someone this bad in my entire life but I just want y'all to beware of this place. DON'T COME HERE OR YOU WILL END UP LIKE ME WITH NOTHING LEFT. read more

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Great service,I came in for a new motor for my 2009 Rx-8. Now my motor has 4K miles with zero issues and no leaks! Thank you Yoshi!

Trying to find an honest mechanic or shop seemed like trying to find a leprechaun or a unicorn but they do exist and Neptune Speed IS THAT SHOP! They are very honest. They don't try and up-sell you on some bogus stuff. I will never take my cars to anywhere else. AWESOME PLACE, GUYS! A+ read more

NOT TOO MANY MECHANICS WORK ON ROTARY ENGINE. Mazda Dealership, Mazda Trix in Long Beach and Neptune Speed in Huntington Beach are your options. Neptune Speed can diagnose, recommend and replace the Intake valve Solenoid and Air Solenoid. Neptune Speed can also replace a set of 4 spark plugs, 2 spark plug wires, 4 ignition coils and upgrade the starter with one for a newer model RX-8 for a faster cranking speed. read more

These guys are first class people. After Honda messed up my vehicle I got on yelp to find a good shop to fix what they did. SO GLAD I found this place. They're super nice, affordable, reputable, and they fixed the issues that Honda created. The best place to take your car. read more

I like these guys a lot! I was worried when my brakes started making a weird, screechy sound. I brought my car to Neptune Speed without an appointment, and even though they were busy, one of the guys took a little time to check my brakes out. 5 minutes later he came back and reassured me that they were fine for at least another 10,000 miles and that the sound was probably due to some harmless dust. They didn't charge me a penny. I think a lot of other mechanics would've taken advantage of my concern and urged me to buy new brake pads on the spot. Needless to say when I actually need new brake pads, I'll be going to these guys. Thanks! read more

Yoshi is the man. Came in to get my rear sway bar installed and left happy. Great customer service.

Yoshi is the man! I found this place on Yelp and was super excited to go and see what all the hype was about....and needless to say I was impressed! Yoshi is very kind and very courteous and tells you what you do or do not need. I kept trying to say doesn't it need this....doesn't it need that....and he said No. Another mechanic had led me to believe my car needed a gazillion repairs. But Yoshi was honest and led me down the right affordable path! Since then i've been referring anyone who says they need a mechanic. Take your car there and you won't be disappointed! oh...and when I needed a new radiator and thermostat I was being quoted at places for over $500 and Yoshi's price was much much more reasonable! Thank Yoshi...see you soon for that tune up! read more

Best mechanic shop in SoCal They're good at all kinds of car especially Japanese car and rotary powered car like rx7 and rx8. read more

Love Yoshi!! He's kind, honest, and very knowledgeable. As an out of state transplant I was very lucky to have found his shop via yelp. I've been a satisfied customer for 8 years and counting and there is no one else I would trust to work on my vehicles. read more

I was helped by Anthony and I just received the best customer service. He said saturdays was only by appointment because I just showed up but he still took care of me and changed the oil in my car. he was fast and he even advised me on how to take care of it better. Definitely coming back. Thanks Anthony! read more

There are places that love your money, and there are places that love your car. Neptune Speed are one of those that genuinely love your cars. This is a small shop run by two people. The owner, I think his name is Yoshi, and his worker Leon. These guys own and rebuild rotary engines. That alone should tell you that they love Mazdas. If you have a Mazda bring it here and save yourself a bunch of money by not going to a dealership. That said, they also work on other makes. I saw a Porsche and an Acura in the garage being worked on. My car had a weird idle problem. I called a dealership with decent ratings on Yelp (Browning Mazda). When asked if they would charge me just to diagnose the issue I was told it was going to be $115 just go get the car looked at. OVER A HUNDRED FREAKING BUCKS! So I called Neptune Speed up. Leon picked up and he admitted that if the car needs an ECU reflash they would not have the tool to do it and I have no choice but to take it to a dealer. I described the problem to him and he said he knows for sure it's not an ECU issue but rather a problem with the air intake and oxygen sensor. He told me there would be no charge for the diagnosis. So I brought the car in and have it looked at. Sure enough when I came in the intake and oxygen sensor was really dirty. At start up the butterfly valves would get stuck causing the car to go crazy. Leon decided to stay behind after closing time to work on my car. After everything was done he hooked up an OBD-II scanner to make sure that the car was idling just right (after comparing specs with the stickers on the car). When he rang me up at the register he even gave me a small discount for being a first time customer. Leon told me that whenever I work on my own car and need some help just call him and he'll tell me what to do. This sort of thing you never see at a dealership. His price was really reasonable. Needless to say next time my Mazda needs a major service I'll be coming here instead of a dealer. read more