Switching to synthetic oil problem

[why?]

The problem with synthetic oils in older cars is they clean everything out too well. So then you get every single leak that normal dino oil filled in leaking all at the same time.

[racerb]

Originally Posted by why?

The problem with synthetic oils in older cars is they clean everything out too well. So then you get every single leak that normal dino oil filled in leaking all at the same time.

Exactly right, Amsoil recommends using their engine flush first before even pouring in the first quart. Most cars never get the proper service, so all kinds of bad things show up.