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From digest.v7.n587 Thu Nov 13 23:56:09 1997
Date: Thu, 13 Nov 1997 20:22:07 -0500 (EST)
Subject: LSD + mobil 1 #2

I work on a GM account Pontiac-GMC specifically, there was a service bulleting issued in regards to rear end lube. For non LSD units a straight non synthetic GL5 was to be used. In the Camaro, Firebird and Corvette the GM Positraction additive was to be added. In the trucks with LSD there was to be no additive used. In any non LSD rear end a synthetic could be used. I talked to my techinical assitance group about this and the reasoning behind it. The synthetic is to slippery for yhe clutches to acutate. The lube will acutally form little balls on the clutches from the heat generated. I have experinced clutch chatter in my Corvette with a full Posi rear end and it is quite different from the feeling I was getting out of the BMW The clutches in the newer BMW LSD's may have been adapted for use with a sythetic lube. When I had Redline in the rear it did not act up. I have a theory that given the vintage of the car that Mobil 1 is just to slippery for the rear ends to work properly, it sounds like in the new cars the friction coeficents for the LSD clutch discs has been altered. I have 4 quart bottle's of Mobil 1 75w-90 if anyone is interested???

Derek Atkin
85 535i 150k
BMW CCA 136755

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