I have a 1981 300d with a newer motor.The motor was replaced in the late 1990's with a MB reman.I looked down into the intake and noticed that it was filled with sludge and oil.The motor only has about 100k miles on it so it seems to early to have blowby so what could cause all this oil to be in the intake?
I removed the whole air cleaner asm and the intake manifold and cleaned it.Inside the head the same sludge was coating the intake valves/chamber.I cleaned that out as best as I could but have never seen so much sludge in an engine.The car drives great and does not smoke the egr is disabled (for testing of course).I would like to know what causes this so I do not have to clean the intake out again.

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