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Date:         Wed, 3 Oct 2007 07:14:51 -0400
Reply-To:     Mike S <mikes@FLATSURFACE.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mike S <mikes@FLATSURFACE.COM>
Subject:      Re: (UPDATE) Re: Mobil 1 and SM rating...
Comments: To: Wesley Pegden <wes@CS.UCHICAGO.EDU>
In-Reply-To:  <4702CF0A.6070706@cs.uchicago.edu>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 07:06 PM 10/2/2007, Wesley Pegden wrote...
>Just wanted to follow up on this:
>I just got off the phone with Mobil 1.  The technician I spoke with
>said
>that the 15w50 still had high levels of Zinc and Phosphorus, even with
>the SM rating.  So unless anybody hear knows otherwise, I'm going to
>assume it's okay...


The limits placed on phosphorus and sulphur content by the API SM spec
only apply to weights 0W-20, 5W-20, 0W-30, 5W-30, and 10W-30. None of
those weights are suitable for a VW. There is no limit on zinc, except
indirectly as a part of ZDDP, which is due to the phosphorus limit.


This is found on page 61 of this API document:
http://www.api.org/certifications/engineoil/pubs/upload/1509_16thedition042007.pdf
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