Curt:
At the full mark the cam shaft is submerged in oil, the only source of
lubrication for the lobe-to-tappet surfaces. The shaft is ABOVE (out of)
 the oil at the low mark.
Good Luck
Ken Lewis

On Fri, 23 May 1997 06:10:17 -0500 JCSYNCRO@aol.com writes:
>My '87 Syncro allows oil to leak out and show up on the rear window IF 
>I fill
>it to the full mark on the dip stick.
>
>At about 1/2 quart down from "full",  it no longer leaks.
>
>Is there a common fix for this, or does everyone run 1/2 quart down?
>
>Curt Long
>Maple Valley, WA  (No longer in Thailand)
>'87 Syncro Westy
>Many other toys
>