Quote:
Originally Posted by Yuille36
I used 75W-140 in the entire diff. Although this is supposed to use on the left/right side only where the clutch packs are located. 75W-90 is supposed to be used in the center for the ring & pinion. But the forum ridiculed me for doing so, but after months and many miles, I haven't experienced any issues. At the end of the day the major differences between the two, is one has an friction additive added. So should you be worried.....no not in the slightest.
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So the 75w140 doesnt have friction but the carbon does? Well friction additive was the one causing issue on e9x m3 diffs. If i am not mistaken it was making noise on turns. How many miles you are with the 75w140 ?