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      12-04-2011, 04:38 PM   #38
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Drives: E92 M3
Join Date: Sep 2006
Location: San Diego, CA USA

Posts: 10,201
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Just FYI, the OEM BMW fluid and the Castrol are indeed identical in viscosity, 75W140. Next change I will likely go with Redline+FM additive. Although you could probably use the Redline FM additive in the Castrol gear oil, I'll stick with products from the same manufacturer that have been tested together.