How do you add Transmission Fluid to 2000 CLK430.... there's no dipstick?


Had the rear up on jacks for a couple of days and tranny fluid leaked out in substantial amount. There's no tranny fluid dipstick and I'm at a loss as to how to add back the fluid that leaked. Any help would be appreciated.
Thank you.
You’ve probably noticed that the dipstick tube is there, but the tube is capped. You’ll have to buy a dipstick. Now for the rub – there are two sets of minimum and maximum marks on the dipstick. When a dealer adds transmission fluid to a car with a 722.6* transmission, he hooks the car to a STAR diagnostic machine to tell him the fluid temperature. When the transmission fluid is at 25 degrees Celsius, the fluid level should be between the Min and Max settings that are at the end of the dipstick. When the fluid 80 degrees Celsius, the fluid level should be between the Min and Max settings that are further up the dipstick. The fluid level is temperature dependent. My WIS states that if too much or too little fluid is in the transmission, malfunctions and damage will occur. A $50 infrared pyrometer (that’s assuming they haven’t dropped to the $25 range by now) can be used to check the fluid temp.
Link #1: http://www.ebay.com/itm/Mercedes-Ben...item5d3079873a
link#2:http://www.ebay.com/itm/Digital-IR-I...item20b1fe6651
You’ve probably noticed that the dipstick tube is there, but the tube is capped. You’ll have to buy a dipstick. Now for the rub – there are two sets of minimum and maximum marks on the dipstick. When a dealer adds transmission fluid to a car with a 722.6* transmission, he hooks the car to a STAR diagnostic machine to tell him the fluid temperature. When the transmission fluid is at 25 degrees Celsius, the fluid level should be between the Min and Max settings that are at the end of the dipstick. When the fluid 80 degrees Celsius, the fluid level should be between the Min and Max settings that are further up the dipstick. The fluid level is temperature dependent. My WIS states that if too much or too little fluid is in the transmission, malfunctions and damage will occur. A $50 infrared pyrometer (that’s assuming they haven’t dropped to the $25 range by now) can be used to check the fluid temp.


The intake setup on my 430 is different from stock, as the original setup was replaced when it was Kleemannized. Hopefully the tube lurks below the intake. I'll remove the intake this weekend and take a look and report back. But definitely thank you all for the info on the rest of the process, once I'm tubed.
The intake setup on my 430 is different from stock, as the original setup was replaced when it was Kleemannized. Hopefully the tube lurks below the intake. I'll remove the intake this weekend and take a look and report back. But definitely thank you all for the info on the rest of the process, once I'm tubed.

Last edited by Silv430ClkR; Dec 2, 2011 at 11:20 PM.
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When you replace the fill tube cap, if you don't install a new locking tab/stem, the cap might bounce off of the tube as you drive around. The dealer should have these tabs for about a buck. I modified one so that I can remove it and reinstall without having to break the tab off.
MB came up with the idea of lifetime fluid--brilliant. If your fluid is very dark, looking black, don't be surprised. The Trans. has graphite components that will discolor the fluid prematurely. So, just being very dark does not necessarily mean that it is burned or old.
For the 722623 transmission there is no need to buy the larcenous MB fluid.
Valvoline Maxlife is fully compatible at less than $3 a Qt.
I can post the MB Tech. service bulletin, and the Valvoline compliance letter recommending the Valvoline product.
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Last edited by Pancho; Dec 4, 2011 at 02:54 PM.
Examine and action the stem/tab in the cap until you can figure how it works, and locate the locking edge on the stem, then radius it.
Best I can do.
Last edited by Pancho; Dec 5, 2011 at 12:09 AM.


I feel like a total noob having failed to remove the intake in the first place! This forum is really great and I sincerely appreciate the all of the advice and the time you've each taken to post it.
A digital IR thermometer aimed at the trans pan will give an accurate fluid temperatures. The lower one is more or less at ambient for the initial filling check. The higher one (80 deg C) is checked after a 5 mile drive has warmed up the oil.

The procedures correspond to what my tech did on my amg and my G. now I understand the driving he had me do while he was carefully replacing the fluid.
My old fluid was clear. The weren't worried but does anyone knowable have an opinion?
He also dropped the pan and thoroughly cleaned and dried it, changed the transmission filter and cleaned the magnet that thankfully was pristine. He replaced the gasket with a new one, and if I recall torqued the pan to spec. We used new MB bottled fluid since he gets it in bulk.
Op - was you leak caused by the electronic interface possibly in the front or a bad gasket? Just some thoughts....


Got the dipstick tool and the IR Thermometer and spent last night getting her all squared away. Since the fill tube sits directly under my intake tube, and since the car has to be running (with intake in place) in order to check trans fluid level, I had to loosen/remove the clamp at the upper end of the fill tube that secures it in place so that I could nudge the upper portion of the fill tube out towards the firewall and out from under the intake in order to be able to slide the dipstick tool in and out to measure level with engine on.
She drank 1 and 1/2 quarts! Not good.... I haven't traced the leak, but I suspect that it's the connector with the lousy O-Ring that's been described in other threads. It's a slow leak, unless I have the rear raised way up on jacks. Plan to do the O-Ring replacement next. But she's shifting like a champ now.
Used Valvoline MaxLife fluid, based on the info in this thread.
I really want to thank you all so much for the advice and guidance and wish each of you a Merry Christmas!
Also have rub sound from steering wheel creak sound from right rear side and clunk sounds like it is right under me. If anyone can help I would appreciate it and maybe there is something I can help you out with since I had to do a lot to both cars . thanks and I hope to hear from you guys
Last edited by Lorenzo; Aug 31, 2014 at 01:03 PM.








