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  #1  
Old 02-01-2009, 09:23 PM
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Manual transmission oil options

I've seen a bunch of postings on using different oils/fluids in the Mercedes manual transmissions. ATF, various oils, Redline MTL etc.

Now, I've got a '72 220D that has a finnicky transmission. After suspecting the clutch hydraulics (still under investigation) I also feel that it probably has been a LONG time since the tranny oil has been changed, and, who knows how much is in it.

This transmission is notchy/grindy. I've read that using the Redline would make this even worse. I've also read that using a heavier oil like 5W-30 or 15W-40 might be just the thing for an old worn transmission.

Any suggestions? I want to drain/refill this week, if the weather allows.

mark in Portland
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Old 02-01-2009, 10:18 PM
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Unless the specs changed from 1968 to 1972, these transmissions were originally charged with automatic transmission fluid. I found this a bit tough to believe when I first found this out during a fluid change on the 1968 220D. However all the manuals and service documents that I have found for these cars agree that ATF was the manufacturers fluid of choice and design. Over the 20 years we drove this car it was a pleasure not to have to put it into gear with a foot if the temp was below o* F.

Today's ATF is not the same as 1970 product, but a reasonable equivalent can be found.
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1968 220D/8 325,000
1983 300D 164,150
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  #3  
Old 02-02-2009, 11:08 AM
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I have used "Red Line MTL" in my 5 spd trannys but I now use the heavier 5/20 in my "79" as it has allot of miles on it and was making a little noise. Its now allot better
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1985 Euro 300TD 5 spd 220K
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1979 240D 5 spd, 40K on engine rebuild
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Old 02-02-2009, 11:59 PM
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5/20??

STevo

what do you mean by "5/20", regular motor oil?

mark
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  #5  
Old 02-03-2009, 02:57 AM
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Start with regular Dexron III (aka cherry juice). If it still doesnt' work right, post back to us.
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  #6  
Old 02-03-2009, 09:36 AM
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Quote:
Originally Posted by abracadabra View Post
STevo

what do you mean by "5/20", regular motor oil?

mark
http://www.maperformance.com/mobil-1-5w20-synthetic-motor-oil.html
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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