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· Registered
E63AMG, SLK32AMG, Ferrari 348 Spider, R350 Bluetec, Eagle Talon TSI/AWD, Jeep CJ7, Smart EV
345 Posts
Discussion Starter · #1 ·
A friend with a w211 E3504matic (2006) recently showed me his coolant. It was the original yellow coolant (never changed) and it had a nasty oil film inside the overflow tank. I've never seen this scenario before. How bad does this seem? Where is a good place to start? Drain/fill coolant and see if the oil returns?


· Super Moderator
02 ML500, 00 ML320, 05 E500 4M Wagon, 99 ML430
23,713 Posts
You could also do a combustion gas test. Most of the big box parts stores loan out the equipment.
You would ave pay several dollars for the fluid needed to run the test.
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