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Just bought a 2002 SLK 230 and this seems to be THE place to keep it as it should be. The forum has been very useful in sorting out various common issues already so I thought I must say hello and thanks for all the useful info.

One very simple question - checking the auto transmission fluid level hot mine appears to be too high - the level is above the black plastic calibrated end of the dipstick and it about 10mm up the flexible metal part. The transmission works fine. The engine temp sits above 80C which is over the spec for measuring the fluid level - is the running temperature critical enough that a few degrees would make this difference or is it simply that the PO overfilled the ATF?

Thanks for any comments.

Ray
Ipswich UK
 

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Hi Ray,
@Dave2302 @M4rCu5 @Turdo2 Will brief you on the transmission when they drop by.

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Just bought a 2002 SLK 230 and this seems to be THE place to keep it as it should be. The forum has been very useful in sorting out various common issues already so I thought I must say hello and thanks for all the useful info.

One very simple question - checking the auto transmission fluid level hot mine appears to be too high - the level is above the black plastic calibrated end of the dipstick and it about 10mm up the flexible metal part. The transmission works fine. The engine temp sits above 80C which is over the spec for measuring the fluid level - is the running temperature critical enough that a few degrees would make this difference or is it simply that the PO overfilled the ATF?

Thanks for any comments.

Ray
Ipswich UK
Hi Ray, welcome :)

A few observations..

Do you have the engine running?

The 'usual' way to check the fluid level is to get the car on level ground (ideally a lift) and measure the trans oil pan temp with an infrared thermometer - 80c - Car ticking over in Park

ATF expands as it gets hot so that's an interesting question that @Dave2302 is more qualified to answer than I am because I've never heard of anyone checking the level with the temp above 80c :surprise:

Where did this dipstick come from? It is correct for MB I assume?


Kent has put together a few useful videos for perusal:






HTH
 

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Discussion Starter #12
Do you have the engine running?

The 'usual' way to check the fluid level is to get the car on level ground (ideally a lift) and measure the trans oil pan temp with an infrared thermometer - 80c - Car ticking over in Park

ATF expands as it gets hot so that's an interesting question that @Dave2302 is more qualified to answer than I am because I've never heard of anyone checking the level with the temp above 80c :surprise:

Where did this dipstick come from? It is correct for MB I assume?
Hi and thanks for the input.

Yes the dipstick and method I'm using are correct, I think my question is really about how accurately does the transmission need to be 80C. I was using the engine coolant temp as a rough guide - that's the 85C approx it was at. If the real life requirement is take the car for a 10 min run to warm it up then that's simple and I clearly have too much ATF. If I need to precisely measure the transmission temp and only measure the level when its exactly 80C it can be done but its going to be a pain to do.

I didn't think about using an IR thermometer so I'll give that a go. IR thermometers are only as accurate as the surface emissions from whatever surface you are measuring but probably the black transmission pan will be near enough.

It'll be interesting to hear what the real life method is.

Thanks again

Ray
 

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Hi Ray, welcome from Canada :smile:
 

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Dont overthink it.. If it's shifting fine and the fluid isn't low, then you are good.

I HAVE experienced decent fluctuations in level based on temperature.
 

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Hi from Florida!
 

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Hi Ray, Welcome from the Sacramento Valley SLK Enthusiasts!
 
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