I have used full synthetic in all my cars, regardless of the mileage, and have never 

had oil leaks because of it.

I can't give you a source, but remember reading somewhere, maybe this list, that
leaks in older engines caused by the new use of full synthetic is a myth, i.e. no factual basis.

YMMV

Anthony
'89 Syncro GL (Hidalgo)

________________________________
 From: neil n <musomuso@GMAIL.COM>
To: vanagon@GERRY.VANAGON.COM 
Sent: Sunday, May 13, 2012 3:49 PM
Subject: Castrol Hypuron 15W-40 Synthetic Blend?
 
Hi all.

Searched� "Hypuron" in archives. Didn't get any hits.

I don't know if the TBN and Low Ash aspects help a gas engine, but
looking at "Oxidation Control & Shear Stability" here:

http://www.castrol.com/castrol/genericarticle.do?categoryId=82915547&contentId=7025207

seems this might be a decent oil with a good price balance between
100% synthetic and conventional oil.

Has/is anyone using this product?

When introducing a synthetic blend oil to a an engine that's been
running NON synthetic, is there a high risk that the new oil will
cause seals to leak?

My goal isn't to extend oil change intervals. Just want to provide
better protection for bearings etc.

Neil.

-- 
Neil n

65 kb image Myford Ready For Assembly �http://tinyurl.com/64sx4rp

'88 Slate Blue Westy to be named.

'81 VanaJetta 2.0 "Jaco" �http://tubaneil.googlepages.com/

Vanagon VAG Gas I4/VR Swap Google Group:

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines