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#1
03-12-2019, 08:22 PM
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722.6 transmission fluid level
What I am looking for is a rough measurement of the fluid level when the vehicle is cold and on level ground, using the dipstick tool.
The internet has so many conflicting instructions on how to measure the fluid level when hot that I figured to approach it from a different perspective. There has to be a ballpark measurement when the car is parked overnight and the transmission is cold. PLEASE chime in, any replies will be greatly appreciated
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Currently Driving 2006 E320 CDI 1999 E300 Turbo Diesl 2002 ML500 1995 E320 Station Wagon MBs I've owned 1997 E320 Assassinated by Pine Tree 1987 300E Wife Killed Engine 1981 300D Stretch Limo Total Loss 1970 250 Coupe 212,000 mi. 1974 450sel 184,000 mi. 1974 240D 377,000 mi. 1977 300D 204, 000 mi. 1979 280se God Only Knows! 1983 240D 130,000 mi. 1972 220D 280,000 mi. 1983 300SD 244,000 mi. 
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#2
03-12-2019, 09:32 PM
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Some amount of fluid will drain back from the torque converter, which is unpredictable. Hence all methods are while running. Also, cycling through all gears is important to ensure all clutch and brake actuators are full. I used to work for a transmission manufacturer, so I am very familiar with the reasoning.
Drive vehicle for 20-30 minutes. Stop and cycle through all gears including S and L, stopping in each gear for 2-3 seconds. When you're back in park pull dipstick and wipe. Reinsert, pull again and check. If you need to add, do no more than a few oz at a time. Once you add, it gets a little tricky to check as the oil will obfuscate the reading. It is usually easier to drive a few more minutes to keep the temp up and then recheck. If you follow this method you can get reliable readings. Don't overfill. Aerated fluid is bad and you'll get erratic shifting or flaring.
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#3
03-12-2019, 09:47 PM
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On the 722.6 you are supposed to read it at exactly 80 C with the engine running with the special stick.
Preferred method is to read the transmission codes with a computer to get the fluid temperature from the internal sensor. A close alternate is to use an IR thermometer to get the pan temperature. There were different control systems tied to the 722.6 transmission. The W210 used a mechanical shift linkage that pulled the lever on the transmission for P-R-N-D and then the 4-3-2-1 was electronically communicated to the transmission. When you pull the handle to the left it decouples from the transmission lever and just actuates switches in the shifter. (This is why spilling a drink in the shifter kills the transmission computer on these cars.) The W211 uses an all electronic shifter mechanism (at least my 2008 does since it has a 722.9, not 100% sure how the pre-2007s handled this). The reason I bring this up is that it is not like the older 722.3 and 722.4 that were directly mechanically controlled from the shift lever and it’s not as easy as just shifting to the lower gears especially on a W211. On a 210 you can force the lower gears by selecting the 4-3-2-1 manually on the shift lever. On a 211 you’ll have to rock the shift lever side to side and watch the counter on the instrument cluster to ensure you’ve achieved all the gears.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#4
03-12-2019, 11:03 PM
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Helpful tip.
There is a small plastic triangle on the bottom of the measuring tool. It is to be gently inserted just to the point where you feel it touch the bottom. You will be at the bottom of the fill tube. You can push harder and push past that point into the pan and the tool will land on the bottom of the pan, you have gone too far! Just insert till you gently feel it bottom out on the fill tube.
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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-( 2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250, Dec 2024 145,000 miles
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#6
03-13-2019, 10:46 AM
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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-( 2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250, Dec 2024 145,000 miles
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#7
03-13-2019, 11:01 AM
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My own DIY dipstick has a 25cm mark which I use for cold level check, Start the engine, let it idle, check the level, if its at the 25cm mark its good for driving, if you dont see anything, add till you get to the 25cm mark.
btw - this is only applicable if your ambient temperature is between 70~85F - if you are checking it when rain water is frozen and polar bears are around, it wont work. Once your cold level is set, drive it around till the transmission is warmed up and check again.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017)
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