On Fri, 26 Oct 2007 05:05:53 -0700, Joe
wrote:

I heard that if you switch and do not switch back you will not have
leaks.

Anyone switch to synthetics and stay switched?

I did it with an older sailboat diesel once. It was a disaster. The
engine developed a major oil leak around the main bearing seal in no
time at all. I've never used synthetics since then.