Hello List, The Amsoil SDF42 oil filter also has the anti-drain back valve. They are pretty expensive but worth it I think. I also bought an amsoil life-time air filter and will probably put Amsoil oil in my car at the next oil change. I believe it is $9.50 per quart.(25,000 mile) Does anyone on the list use amsoil in there car? Is it really safe to go 25,000 miles if you keep changing your filter? later David