I use as many Lucas products as I can I am very picky on what i put into my truck lucas gear oil lucas trans fix even though never had a problem with trany still use it and it works fine i use synthetic oil stabilizer synthetic 5w30 oil lucas fuel treatment in my tank every fill up and my truck drives brand new and has 80,000 miles i also use lucas on my 2008 polaris atv and doesnt void warenty dont be afraid to use lucas get the best performance out of your vehicle and not have to worry about beak down 100% sold!!!