Transmission fluid
#3
MBWorld Fanatic!
The transmission isn't sealed, but there was a time when Mercedes-Benz didn't feel it had to be serviced. Mercedes-Benz has sinced reversed that position and is now recommending that the 722.6 transmission be serviced.
My local Mercedes-Benz dealer serviced mine. The invoice shows nine quarts of fluid. Many people have had their transmission done where they only require 4 quarts (simply drop the pan and change the filter). The difference is whether the fluid in the torque converter and cooler is changed as well. Later cars such as mine do not have a torque converter drain plug, so other steps are required to drain all the fluid.
Lastly, per the WIS fluid level is temperature dependant.
My local Mercedes-Benz dealer serviced mine. The invoice shows nine quarts of fluid. Many people have had their transmission done where they only require 4 quarts (simply drop the pan and change the filter). The difference is whether the fluid in the torque converter and cooler is changed as well. Later cars such as mine do not have a torque converter drain plug, so other steps are required to drain all the fluid.
Lastly, per the WIS fluid level is temperature dependant.
#7
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But you must find a dealer or shop that can change it via the flush method. It involves hooking up a flushing unit to the hoses that go to the transmission fluid cooler and running about 20 quarts through the system. It's the only way to ensure all the fluid in the torque converter (and metal particles it contains) gets replaced. Call around until you find a shop that knows what you're talking about. And make sure they use MB transmission fluid. It's expensive but is the only acceptable stuff. You'll then be good for another 75K miles. If you can find a dealer that does it, that would be your best bet.
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#8
You should definitely do it. In fact, 75K-100K is the recommended interval now.
But you must find a dealer or shop that can change it via the flush method. It involves hooking up a flushing unit to the hoses that go to the transmission fluid cooler and running about 20 quarts through the system. It's the only way to ensure all the fluid in the torque converter (and metal particles it contains) gets replaced. Call around until you find a shop that knows what you're talking about. And make sure they use MB transmission fluid. It's expensive but is the only acceptable stuff. You'll then be good for another 75K miles. If you can find a dealer that does it, that would be your best bet.
But you must find a dealer or shop that can change it via the flush method. It involves hooking up a flushing unit to the hoses that go to the transmission fluid cooler and running about 20 quarts through the system. It's the only way to ensure all the fluid in the torque converter (and metal particles it contains) gets replaced. Call around until you find a shop that knows what you're talking about. And make sure they use MB transmission fluid. It's expensive but is the only acceptable stuff. You'll then be good for another 75K miles. If you can find a dealer that does it, that would be your best bet.
Flushing would require the use of more ATF than required. Expensive. Another method would be to drain additional fluid from the pipe going to the cooler at the front of the car, behind front fender. Also recomended that the G/Box sump pan is removed and new filter is fitted, magnet cleaned and refit with new gasket seal.
Refill via the dipstick filler, fit new plug and pin.
Last edited by C240LEE; 08-16-2007 at 07:54 AM.
#9
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'96 SL600, '05 S55 AMG, '06 C230
In the UK, the general feeling is to replace the fluid at 60K miles or 3 years. Yes, MB spec fluid is mandatory on the 722.6 box.
Flushing would require the use of more ATF than required. Expensive. Another method would be to drain additional fluid from the pipe going to the cooler at the front of the car, behind front fender. Also recomended that the G/Box sump pan is removed and new filter is fitted, magnet cleaned and refit with new gasket seal.
Refill via the dipstick filler, fit new plug and pin.
Flushing would require the use of more ATF than required. Expensive. Another method would be to drain additional fluid from the pipe going to the cooler at the front of the car, behind front fender. Also recomended that the G/Box sump pan is removed and new filter is fitted, magnet cleaned and refit with new gasket seal.
Refill via the dipstick filler, fit new plug and pin.
#10
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This will not drain the torque convertor, which has no drain hole. That is why flushing is the only way to truly replace all fluid.
#11
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You can use either A001 989 21 03 10 or A001 989 45 03 13. The first one is for the 722.6 (5-speed) transmission only; the second one is the later fluid for the 722.6 and 722.9 (7-speed) transmissions.
#12
Yes, same P/Ns that we use in the UK for 722.6. Unfortuneately, our measrurements have changed over to litres. 7.6 capacity for the box, including TC and pipes
#13
Even running it for 5 seconds without oil in the transmission is probably not a good idea.
Cleanliness is the key in this area. Not one spec of grit should be allowed to enter the transmision while the sump is off.
This is a great site. Lots of good info going around from you guys.
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#14
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BMW E30. I've turned to the dark side.
HMMM, Lots of opinions going around here, so i'll add mine. I've serviced many of these transmissions and agree that 50-75k is when they start needing service. I do not feel a flush is neccessary unless a lot of debris is found or the fluid looks like poo. cars up to late '99 have a T/C drainplug and anything that old should have all the fluid dumped anyway. otherwise a 4-liter fresh up at 50-75k mi including a filter is just fine. remember the ENGINEERS at MB originally said this stuff would last for a 'lifetime'. one other option- and i did this in my ML, drain the pan only, refill it and run the car for a few minutes(weeks in my case) then do the normal 4L service with the filter, dropping the pan etc.
#15
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#17
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