I thought that all M104s had an oil cooler. I know that my 97 C280 and the 97 E320 had them, I would assume the C36 has it too.

The oil cooler on these vehicles is a oil-coolant heat exchanger deal that is located under the oil filter housing in the back of the engine.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record