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1984 MERCEDES-BENZ 300 TURBO DIESEL, 1978 CHEVROLET K20 CUSTOM DELUXE
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365 Posts
Discussion Starter #1

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1984 300D
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5,099 Posts
anyone:crybaby2:
At Autozone I bought what ever went up to I think it was 90; but it was multiviscisity.
My preference would be single wt90.
But, I am Old Fashioned.

Just, some decisions you have to make on your one.

General comments
Many People do not even know there is Oil in the Differential and never have it checked in the whole life of the Car.
I mean you buy a 25 year old Car and the Differential Oil has never been changed and most often it looks OK; as about the only thing that contaminates it is Water condensation of if it got submerged in Water.
I have bought a used Cars and found the Differential Oil level to be low and a tiny bit of emulsified Oil at the Bottom (Water Plus Oil).

In short I believe anything made for the Job is going to be OK.

Oddly I have never read anything concerning differential Oil and Cold Climates.

When I was in the Army in Germany we changed the Motor Oil to Winter Weight during the Winter but never the Manual Transmission or the Differential.
 

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1982 300CD
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5,159 Posts
AFAIK, you change it with the axles when those become an issue (due to torn boots). I used Mobil 1 75W90. I am sure it will hold up equally as well as the 30-yr old dino stuff that was in there.
 
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