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      01-25-2010, 11:33 PM   #6
bmw6953
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Drives: 2006 325i
Join Date: Oct 2008
Location: california

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The correct stock diff fluid in the E90 is Castrol SAF-XJ and its s 75w-140 wieght. I substituted mine with Redline 75w-140 and the exact quatityis 1.2 liters

Alot of the earlier bmw models run of Castrol SAF-XO wich is a 75w-90 weight.

From the Reddline website
Differential:
SAF-XO & SAFX-LS => 75W90
SAF-XJ => 75W140

Im sure either one would work though.