Has one tried any of thise stuff?
http://www.stp.com/oil_stabil.html
It totes that it has more ZDDP then leading products and
Protects engine parts against corrosive wear by helping to combat internal motor rust
Reduces deposit buildup to help fight ring sticking
Conditions seals to help stop minor leaks
Increases the level of dispersants to help reduce sludge deposits
Boosts the level of detergency to help keep your engine clean
http://www.stp.com/oil_stabil.html
It totes that it has more ZDDP then leading products and
Protects engine parts against corrosive wear by helping to combat internal motor rust
Reduces deposit buildup to help fight ring sticking
Conditions seals to help stop minor leaks
Increases the level of dispersants to help reduce sludge deposits
Boosts the level of detergency to help keep your engine clean