Not sure of current situation, but earlier true synthetics
could/would swell some rubber (seals) by up to 7%.
aljay

----------
From: Chris S <mrvolkswagen@HOTMAIL.COM>
Reply-To: mrvolkswagen@HOTMAIL.COM
Date: Mon, 9 Sep 2002 11:53:02 -0400
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Adding Slick50 to engine and transmission of 91 Westy,Opinion?

Larry sez: If a synthetic is thinner, I don't understand how it would
increase the
oil pressure.

The way I understand it is that synthetics flow better at lower temperatures
and keep their viscosity better at higher temperatures.  Hence the higher
oil pressure at higher oil temps.  I've been using 15W-50 in my WBX for
sometime now with good results.

Chris,
'85 Westy.