You will get a million IMO from people that have never used it. I use it in my cars and not had an issue. the reason I did was this. The head mechanic for the township I work for uses it everything in the fleet. From fire trucks to police cruisers to dump trucks and done so for years. He has never had an engine go out in the fleet. The Crown Vics get run for 175k miles before they are replaced. He took the valve covers off a cruiser with 150k miles, the thing looked great. I have sinced used this and change in 5k mile intervals. I cannot state it is better than any other oil. It worked for him and it now works for me. Good luck. I run 5w30 in my Stang and 5w20 in my wifes Freestyle.