I apologize fore yet another synthetic oil thread, I just couldn't find what I was looking for! I have a 99 ob with 94k miles and I'l about to do the changeover to synthetic (mobil 1 5w30). I'm using an oem filter and whatnot... Anyway, my question is, for a motor that's had dino oil in it it's whole life, do I need to do any kind of flush before I change completely over? Or will that take away ALL of the deposits in my engine that are actually helping to seal the pistons? Thanks for any input, I don't want to hurt my baby!