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There is oil in my 2004 BMW 320d return pipe from the intercooler to the intake manifold and smoke when started.

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Simple. the trubo bearing/seal (probably more the seal) is stating to go and that is leaking oil into the return pipe. take pipe off and have a look at the turbo and see if you can see any oil leaking from inside of it. also oil in the intercooler = bad clean out after fixing the turbo = use solvent or something to dissolve oil but make sure you let the intercooler dry out before re-installing it

Posted on Jul 11, 2009

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