I bought a brand new 2023 Nissan Altima from Billion Nissan of Bozeman, MT in December 2022. Not too long after bringing my new car home, I noticed that there was a musty smell coming from the vents when the AC was turned on. Since the car was so new and is under warranty, I decided to take it in to Billion Nissan to see if they could find the issue. They ended up telling me they couldn't duplicate the issue but sprayed sanitizer in the vents for good measure. With the weather warming even more, I was using my AC more frequently and the smell was getting worse - especially after the car sat outside in the sun. And to make matters worse, I was noticing mold on the ground of my garage right below where the car was normally parked. I made another service appointment with Billion Nissan and was once again told they couldn't duplicate the issue, but this time they didn't do anything to even try to fix it. During the height of Summer 2023, I was getting fed up and decided to try a third time with Billion Nissan service, but this time I took my car to another shop in town first to see if they could give me some advice. Their expert opinion was that there was likely a block somewhere in the EVAP system and to have Billion Nissan specifically look at the evaporator next time I take it in. A Nissan dealer needed to do the work since my car is under warranty. I took my car into Billion Nissan for a third time, armed with this knowledge. Instead of taking my concern seriously, the service advisor (Heather) rudely told me that I was causing the issue by using the recirculation function in the car too often and that fresh air needed to flow through the car more often. This directly contradicts common knowledge regarding using the recirculation in hot weather: https://www.greasemonkeydirect.com/blogs/news/air-recirculation-button-car After many conversations back and forth where I begged them to look at the EVAP system, I was told they weren't going to waste 6+ man hours on the job when they couldn't duplicate the issue. When I got the receipt from my visit, the service advisor attached to the job had been changed to the service manager (who I never even talked to), likely to avoid Heather getting a bad review from not taking her client seriously and doing her due diligence. After three attempts at working with Billion Nissan to fix this issue that kept getting worse (especially during the 100+ degree days we had this summer), I started a case with Nissan Corporate. Billion Nissan sabotaged the case by telling them it was an owner created issue from using the recirculation button too often. Billion Nissan, and by extension Nissan Corporate, were never going to actually do their jobs to fix this issue, so I decided to take my car to Denny Menholt Nissan over in Billings. I told them everything I had gone through, all the symptoms I was running into, and my theory about the EVAP system. After just one visit, they found a blockage in the EVAP system, cleaned the system out, and fixed the issue that has been bothering me in my new car for almost a year at this point. This is all because they actually listened to their customer and DID THEIR JOB. If you've gotten this far in this review, I strongly suggest you avoid Billion Nissan at all costs. Their service advisors and their techs are incredibly lazy, do not listen to or believe their customers, and practice shady tactics to ensure their reviews stay high despite bad customer experiences. Since I live in Bozeman and will need a reliable place to complete warranty service going forward (and would rather not drive to Billings every time I need service), I am strongly considering trading in my not-even-a-year-old car because of how badly Billion Nissan treats their customers. I will never be returning to Billion Nissan and implore you to do the same. read more