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#1
10-09-2004, 11:17 PM
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W140 500SEL gunk in coolant overflow tank
I recently went to check coolant in tank and found a tan colored foam around the lip of the opening. I reached down in the tank and found a peanut butter color film on the inner top of the tank. I wiped out what I could but I still need to know what caused the gunk.
Thank you 1992 500SEL 
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#2
10-10-2004, 01:06 AM
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Most likely engine oil mixing with coolant. Very likely a bad head gasket. I would take it off the road ASAP. If the engine oil has any froth, don't start the engine until a knowledgable tech checks it.
Sixto 95 S420 87 300SDL
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#3
10-10-2004, 01:46 AM
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As Sixto says, have it . . .
checked asap. It's not so bad to get oil into the coolant but that also means the you're getting water into the oil. Now that's really bad!
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