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  #1  
Old 05-01-2003, 07:27 PM
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Differential oil - What kind?

I am about to change my rear end oil - 1983 300SD what brand and weight?

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  #2  
Old 05-01-2003, 08:03 PM
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80W90 Hypoid gear oil, most any brand will do.

Gilly
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  #3  
Old 05-01-2003, 08:06 PM
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I use whatever is on the shelf that meets the spec that's in the book. I believe what I used last time was Shell 80W90 and it was a GL-4 spec oil.
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  #4  
Old 05-01-2003, 08:17 PM
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You can use:

-Valvoline 80W90 gear oil ($2.8 per quart),

-Valvoline 80W90 Durablend semi-synthetic gear oil ($4.4 per quart)

-Castrol 75W90 gear oil ($3.2 per quart)

-Mobil 1 75W90 synthetic gear oil ($6.99 per quart)


Castrol also has a 75W90 synthetic gear oil whose specs beat those of Mobil 1 75W90 synthetic gear oil, but it's hard to find and costs about $12 per quart

I prefer Valvoline because it's cheap and good brand.

Eric
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  #5  
Old 05-01-2003, 08:21 PM
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BTW, the newest SAE spec for gear oil is GL-5. All of the gear oils I listed is GL-5 compatible. You can also try Redline 75W90 synthetic gear oil. Do not use GL-4 gear oil when you can find GL-5 gear oils everywhere.

Eric
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  #6  
Old 05-01-2003, 08:25 PM
mccan
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I use the Mobil 1 for the detergents. These cars are old and there is no telling how long oil sat in that diff. and left gunk in there. So I drop a fin per quart every diff. change. The volume of oil needed is so low that the quality is worth it. That's how I justify it.
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  #7  
Old 05-02-2003, 03:27 AM
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Thank you. By the way how much should it take and since I know the gear oil is old is there any way I can clean it out before I put the new oil in? How do I tell if all of the old oil was drained?
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  #8  
Old 05-02-2003, 03:49 AM
mccan
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Be CERTAIN to remove the fill plug first. Nothing worse than letting all the oi out of the diff. only to find that the fill plug is frozen. If you are concerned about buildup in the diff., you might consider running it for a few hundred to a thousand miles with fresh Mobil 1. Then drain it. The condition of the oil coming out will let you know if you need to lather, rinse and repeat.
The diff. requires a bit less than 2 qts.
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  #9  
Old 05-02-2003, 04:12 AM
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When I did my diff oil, I had to remove the cover (I was also doing the axleshafts). I took a couple cans of carb cleaner and a brush and cleaned up the inside of the cover, as well as the inside of the housing. You'd be amazed at all the build-up in there!! The inside of the cover was black when I pulled it off, and the color of fresh aluminum when I was done. I went through both cans, and everything looked happy. I then filled the differential with 75W-90 Royal Purple oil. No problems yet!
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  #10  
Old 05-02-2003, 07:45 AM
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How often is this changed, every 30,000 or 60,000?
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  #11  
Old 05-02-2003, 07:49 AM
cmichalik
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Hey Warden. Royal Purple is good stuff. I have it throughout a gasser that I'm selling right now.

When I changed my rear diff oil I went w/ 80w90 Redline sythetic. If memory serves me correctly I had two bottles. I had a little left over. When you are draining be sure to raise each end of the axle one end at a time to be sure to get as much of the old stuff out as possible.
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  #12  
Old 05-02-2003, 10:45 AM
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Mercedes Technical Service Bulletin 00 053, issued 10/1/93, lists "Factory Approved Service Products".

For rear axle differential (not limited slip) the only oil listed is MB Hypoid Gear Oil MB part no. 000 989 28 03.

For coolant, the only approved product is MB Anti-Corrosion/Anti-freeze MB part no. Q 1 03 0002

For brake fluid, the only approved product is MB Brake Fluid (DOT 4 Plus) MB part no. 000 989 08 07 10.

What give with that? Mercedes has approved several types of engine oil and ATF, but seems to think that only Mercedes fluids will work in the differential, radiator, and brakes. I have been using Castrol LMA in my 1979 300SD and it doesn't seem to mind.

For the 1985 300D that I just bought, I think that I will run down to the dealer and get the differential oil and antifreeze and stick with the Castrol in my brakes.
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  #13  
Old 05-02-2003, 10:26 PM
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Amsoil 80W 90 Synthetic Gear lube. I may switch to Redline 75W 90 Gear Oil next time. Have had no troubles with Amsoil, though.
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  #14  
Old 05-03-2003, 03:13 AM
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I switched to valvoline semisyn and it quieted the rear end down nicely on my '73 280 SEL. This product also comes in a convenient squeeze bottle that you can get up to the fill plug without using some kind of pump.

Gotta do this on my Diesel 190D 2.2 soon.

Sholin
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  #15  
Old 05-03-2003, 10:04 PM
dweller
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Quote:
Originally posted by dculkin
Mercedes Technical Service Bulletin 00 053, issued 10/1/93, lists "Factory Approved Service Products".
Your list is just a little out of date. Maybe your dealer will give you a new copy!

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