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M-Class (W163) 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

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Old 11-24-2011, 11:04 AM   #1
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Join Date: Jun 2009
Location: Hampton Roads VA
Posts: 16
Drives: ML320
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front differential oil

Some of you may think this has been beat to death already, but after reading endless posts I am still not certain on which oil to buy for the *front* differential. Alldata says the front takes SAE90, and the rear takes either SAE90 or 85W90.
When I look at the car manual they make no distinction between the front or rear, says 85W90.
So two questions -
1. is the 85W90 OK for the front and rear?
2. Mobil 1 75W-90: this has also been debated before and I think the answer is that MB changed their original requirements to allow this, is that right? I already bought the 75W-90 after reading DETANE's DIY, but afterwards I saw some posts that debated his choice in using this.
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Old 12-04-2011, 02:50 PM   #2
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Join Date: Nov 2005
Location: Palm Beach County, Fl.
Posts: 102
Drives: W163 ML500 w/Kleeman headers, 3.09 gears, 1995 W124 Cab, heated seats, S600 style grill, FOR SALE
Quote:
Originally Posted by Amopower View Post
Some of you may think this has been beat to death already, but after reading endless posts I am still not certain on which oil to buy for the *front* differential. Alldata says the front takes SAE90, and the rear takes either SAE90 or 85W90.
When I look at the car manual they make no distinction between the front or rear, says 85W90.
So two questions -
1. is the 85W90 OK for the front and rear?
2. Mobil 1 75W-90: this has also been debated before and I think the answer is that MB changed their original requirements to allow this, is that right? I already bought the 75W-90 after reading DETANE's DIY, but afterwards I saw some posts that debated his choice in using this.
1. You can use same front and rear.
2. I don't think you are going to do any harm using M1 75-90 unless you are doing some heavy duty towing or equivalent. The lower number is the weight when colde, and I don't think a lighter weight will hurt (although MB must have had a reason for the spec). If you can get the cold specs of what MB requires and measure against the M1 spec, you would have a pretty good idea.

I recently (6 months ago) had work done on both diffs, we used M1 75/90 from my long time MB indy mechanic (who spents years at a dealership) and he had no issues using M1.

Regards,
Jerry
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Old 12-04-2011, 02:50 PM
 
 
 
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2000, 320, change, diff, differential, differentila, differntial, fluid, front, mercedes, ml, ml270, ml320, ml500, oil, read, w163



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