Slk320 oil leak - Mercedes Benz SLK Forum

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

  • 1 Post By Dave2302
  • 2 Post By Australian
  • 1 Post By littleredcar
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#1 Old 05-07-2019
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Slk320 oil leak

I am trying to trace an oil leak in my 2001 SLK320. The area where the upper oil pan and the transmission are joined is wet with a light amber colored fluid. The lower most section of the oil pan and transmission is where the leak is most noticeable. There is no oil stain on the garage floor; therefore, it seems like a small leak/seepage. I suspect it may be engine oil. I am trying to isolate and identify what is actually leaking before I visit my mechanic.

My question is related to a black plastic door/cover located on the rear of the upper oil pan. Specifically, what is the proper way to remove the cover to continue the inspection?

(Would try prying it off and risk breaking it, if I had a replacement. I have looked online for a replacement cover. Unfortunately, unable to find it. Will go to the dealer if necessary.)
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#2 Old 05-08-2019
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Most likely Rear Main Bearing Oil Seal.

M112 / M113 Engines seem to suffer with that when they get a bit leggy

Transmission out to do it

That cover is the Torque Converter Bolt access door, usually pops off with careful prying


Cheers Dave
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#3 Old 05-08-2019
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That sounds like the leak I had. When the transmission was dropped the source of the leak wasn't apparent. It didn't look like the rear main oil seal so the surrounding plate came out (see attached) and was re-sealed. Of course the oil seal was replaced while the transmission was out. No leak since.
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File Type: pdf Rear main bearing.pdf (258.9 KB, 19 views)
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#4 Old 05-09-2019
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Thank you for the information.

I also suspect it is the rear main seal. Have cleaned off the engine and transmission housing. Will inspect periodically over the next few weeks to determine exact location of leak. Want to make sure it's not a failed top oil pan seal leaking into the transmission housing. Hoping to confirm this when I remove the plastic access door located on the top oil pan. The car has 80,000 miles on it. If the rear main seal is gone, will seriously consider replacing the clutch at time seal is replaced. Will be interesting to see what my mechanic has to say.

Kindest regards, Steve
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