Thread: Transfer Case Fluid
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      06-24-2017, 09:17 AM   #6
smass
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Drives: 06 325i - 10 335i
Join Date: Sep 2010
Location: Scottsdale, AZ

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BMW TCs have a wet clutch inside. So most likely something is added to the gear oil to work with the clutches. Much like a LSD differential. Since it only takes 1 quart I use the OEM fluid.
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