In a message dated 8/8/02 12:44:41 PM, warmerwagen@HOTMAIL.COM writes:

>I quit using synthetic after it turned my  Jetta  engine into a
"Lubri-leaker".
>Since I went back to dino the leaking has stopped. Maybe the brand? I used
>Amsoil.

Synthetics have the capability of better cleaning (suspending contaminants in
the oil so that the filter will remove them.) This means that crud that you
have in your engine that MIGHT be blocking leaks, may get cleaned out when
you switch to a synthetic oil...and hence reveal the leak.

It is usually the reason that switching to synthetics on USED engines isn't
encouraged, but if the engine is new or rebuilt, it is encouraged.