You've heard this response already, but this happened to me in my '87.  It
was the oil cooler.  I never had the problem diagnosed, but the symptoms
were quite suggestive.  I bought one from Ken at Vanagain, and it's been
working ever since.  You might want to order the two little hoses that go
to and from the cooler as they're quite expensive from the dealer.

David

On Tue, 31 Oct 2000, sam pacifico wrote:

> Help!  I just went to check the coolant level in the expansion tank of my
> '87 GL and saw a dark sludge-like substance on top of the coolant.  The
> finger-in -the -liquid test confirmed that it is engine oil.  I am hoping
> that someone will tell me that this is a problem with the water pump and
> nothing greater!  Just prior to this I was telling myself how great the
> engine was running.  I had just set the timing and it was purring, actually
> almost silent, at 950 rpm.  Your opinion will be appreciated.
>