How to check ATF level? - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 08-19-2015
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How to check ATF level?

Did a partial ATF service on my SLK recently and put in the approximately three liters that I drained out. I wanted to check the fluid level to make sure it was correct, but ran into a problem. The SLK has the same transmission, 722.6, as my '99 diesel and I have the correct dipstick to check it on the '99. However, on the SLK, the transmission fill tube has a whole lot more twists and turns than the '99 and I don't see how I can use this same dipstick even though it is somewhat flexible. Is there a different dipstick to use on the SLK or do I just try to force the one I have? I'd sure like to make sure I have the fluid level correct. Any tips appreciated.

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Len
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#2 Old 08-19-2015
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Would this work? Looks more like a flexible "wire".

Engine Oil Dipstick for Mercedes Benz W163 R170 W202 W208 W210 CLK320 ML350 | eBay

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#3 Old 08-19-2015
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Len,

For the pre-FL 170's at least, there is a "transmission fluid level tool" (~$20) that you can find and buy online - it looks like a dipstick, but it's much longer - you don't leave it in permanently, you remove it after checking your fluid level. You'll have to break the locking tab (red item at the top of the tube) in order to remove the plug at the top of the tube, so you should buy one of those too. It's not 100% necessary to replace the locking tab but I would ($0.50 each).

The idea with this tool is you measure the "height of the fluid above the floor of the pan", and you have to make the measurement when the transmission is a certain temperature.
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#4 Old 08-19-2015
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Thanks guys. I have what I thought was the right tool - been using it on my '99 diesel for years, but it just seems like there are too many turns in the SLK's fill tube. Sure would like to hear from someone who has used this tool and found that it does work. I tried to force it down the fill tube, but it seemed to take a little more force at one point that I wasn't willing to give it until I was sure.

Here is what I'm using:
722 6 Transmission Dipstick Tool Mercedes C280 C43 C240 | eBay

Len
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That looks like the same one I've got. I do have to give a slight push to get it through to the bottom.
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#6 Old 08-19-2015
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Originally Posted by efair View Post
That looks like the same one I've got. I do have to give a slight push to get it through to the bottom.
Thanks Ed. I'll have to give it a little more muscle when I try it next time. I was afraid of breaking off the tip, so I wanted to make sure someone else had used it successfully before I "Conaned" it. I was pretty sure it was the right tool, but better safe than sorry.
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Len
2003 SLK320 40,000 miles - now lives in Tucson with my daughter
1959 220S Cabriolet - sold - now lives in Malta
1983 240D 351,000 miles original owner - sold
1999 E300D 215,000 miles
2014 Smart electric 17,000 miles
2014 Smart electric 9,000 miles
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