What is in lube control that does the cleaning? I have two relatively new vehicles, 02 ford focus ZTS which ran valvoline until 15K then amsoil XL7500 and a 03 tacoma V6 that has run valvoline until 10K then amsoil Full Synthetic 5w30, so i was wondering what is in it? I am curious as to what i am contemplating dumping into 50K dollars of machinary? I want these vehicles to last forever and am afraid of additives that may damage gaskets/seals. Should I just stick with the conventional oil flush every 30K miles (where you do a couple of short 500 mile interval oil changes)