haha..whoa...never said to go and rebuild the tranny. the point being is to maintain oil consistency. A periodical change of oil would do. Of course all companies will say that but the purpose is to lower the oil breakdown. go ahead and use whatever oil you use. But this old wives tales, goes to desert races. I beat the hell out of my tranny and see ,and have had, a lot of tranny and power steering breakdowns. I do not endorse RP but rest assure I will use that product for cheap insurance then having to rebuild another tranny.