I had my vehicle worked on at Big Guys Auto in Smithville Mo. I have a Isuzu Hombre 4.3 Vortec that blew and intake gasket and leaked vacuum and caused the vehicle to run poorly, but never leaked coolant into the oil, until Big Guys replaced the gasket. They replaced the gasket, and I drove the truck a total of 97 miles and the main bearings failed in the truck due to coolant in the oil. I did not notice coolant in the oil before the knocking so I couldnt prevent it. Took back to Big Guys. They told me engine had failed and a used engine with over 100k would be $3000 installed. They would NOT stand behind their 12000 mile warranty and told me to kick rocks.
I would NOT recommend letting them even change your oil. read more