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TOPIC: 1980 928 ATF level Question

1980 928 ATF level Question 01 Mar 2017 16:32 #19560


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Purchased my 1980 928 just 2.5 months ago as a Christmas present to myself.

Noticed a slight ATF leak. Recently noticed initial slow response in gear shift until few minutes after start up, assume until ATF gets warm. Checked ATF level thinking was low and actually looks high.

Please see attached photos. Is the ATF level too high? Level should be in the notch, correct?

If too high could that be causing overpressuring and the leak? Hopefully it hasn't caused any major damage to seals

Should I remove ATF fluid unitl at the notch level? from what I have read online ATF fluid in 928s is very sensitive.
Thanks for the help



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1980 928 ATF level Question 14 Mar 2017 10:34 #19583


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You did not mention the procedure you used to check, but you have to have the car running to check the ATF. If it is not to the top when not running you are likely already too low! So start the car and check it if you see no or very little oil, then you need to add some.

You will likely need to get the car up on jack stands (with lift bars preferably as well) because you also have to add the oil while it is running! otherwise it will never be enough when it sucks what is in the gauge into the tranny.

The procedures etc are in the library or tech discussion section. Also check that everything is tight while you are under there.
1983 928S - 16v 4.7L L-Jetronic
Dark Grey w/ Blue Leather
85/86 exhaust manifolds
Y-Pipe
SS Hi-perf Cat
S4 springs
Bilstein shocks
Air pump delete
VIN: WP0JB0926DS861180
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1980 928 ATF level Question 28 Mar 2017 07:35 #19609


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MM928 Thanks for the help. Last weekend I put in about 1-1/2 quarts of new AT Fluid to get it to the right level with the engine on and transmission in neutral. Shifts gears much smoother as expected.

I checked the main seal bolting and all tight. Any experience with Trans-X stop leak? A guy in my neighborhood swears by it, but I wanted a good 928 opinion on stop leak in transmission before I put any in. The leak is very minor, must of taken years to leak out 1-1/2 quarts. Not a big deal to add some ATF every year or so.
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1980 928 ATF level Question 29 Mar 2017 11:32 #19614


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Prevailing wisdom for me is not to use additives, especially for the Tran or motor. live with a slight leak if it is otherwise running fine, or fix the leak. These are very solid Mercedes trannys and if they are working ok I would tend to leave them alone. Just keep checking all the connections, clean them well first then look for the leaks. Might just be a seal you can replace.

Have Fun!
1983 928S - 16v 4.7L L-Jetronic
Dark Grey w/ Blue Leather
85/86 exhaust manifolds
Y-Pipe
SS Hi-perf Cat
S4 springs
Bilstein shocks
Air pump delete
VIN: WP0JB0926DS861180
- - Isn't Life great? - -
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1980 928 ATF level Question 09 Apr 2017 11:53 #19630


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Find attached the factory recommended process for checking AT oil level.
3speedtransaxleoillevel.jpg
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1980 928 ATF level Question 09 Apr 2017 11:57 #19631


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For those of you who have a 4-speed automatic transaxle, these are the factory's words.
4speedATtransaxleoillevel.jpg
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1987 928 S4
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