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Hatterasguy is right.. use M1 75W90
I had a "wheel bearing" type noise that my mechanic and I couldn't figure out. We actually ended up even replacing the bearing.
One day I changed the diff oil with M1 75W90 and the problem went away. That was 2 years ago, and no noise since!
Notice the funny noises that happened on cold mornings went away also. Between that experience and putting M1 in a Miata gearbox (couldn't shift into 2nd gear when cold until the M1 was installed!!), I'm converted for life.. It's not worth the $5 savings to skip M1 and put some cheaper fluid in!
Neal
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'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)
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