Did several engine flushes on my 99 Crown Vick.It was done before i knew this site existed.The flushes were all done by the ford dealer.The car has 102k.I won't do that anymore after what people said about it.Was woudering does the dealer have a safe way of doing it or not?I'm worried about the seals&etc if it did any harm.Either way i'm done with them as i don't go for long oci anyway.