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Date:         Mon, 12 Mar 2007 07:25:25 -0400
Reply-To:     Mike S <mikes@FLATSURFACE.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mike S <mikes@FLATSURFACE.COM>
Subject:      Re: GL-5, GL-4, Redline, Sta-Lube, Royal Purple...
Comments: To: Geza Polony <gezapolony@SBCGLOBAL.NET>
In-Reply-To:  <vanagon%2007031201051870@GERRY.VANAGON.COM>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 01:04 AM 3/12/2007, Geza Polony wrote... >when cold. He tells me to change the Redline to dino GL-4. Problem is, >GL-4 >is hard to get. The Royal Purple site says their GL-5 won't damage >synchro >rings, and there are plenty who swear by Redline. I know this has been >a >subject of discussion in the past and have searched the archives, even >finding another reference to Ron in 2003 who was then giving thumbs up >to >GL-5.

If you use a GL-5, it should also carry the MT-1 rating. The reason for this is that the easiest way to meet the high pressure lubrication requirements of GL-5 is to use a sulphur based compound (like molybdenum disulfide). Sulphur compounds eat yellow metals, like used in synchro rings. The GL-5 spec does not require a test for stability in the presence of copper and copper alloys.

GL-4 is good because it requires a ASTM D-130 copper strip corrosion test.

MT-1 (and MIL-PRF-2105E & SAE J2360) also require a D-130 test. If you're going to use a GL-5, it should also carry one of these ratings. Synthetics often carry these ratings, since they usually avoid the use of sulphurous HP lubricants.

ASTM D-130 is designed to assess the relative degree of corrosivity of the sulphur compounds contained in a petroleum product. The test is carried out by immersing a polished copper strip in a given quantity of sample, heating at a temperature and for a time characteristic of the material and comparing the copper strip after it has been washed and dried with the ASTM Copper Strip Corrosion Standards.


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