Thread: Seafoam 335d?
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      09-03-2010, 04:02 PM   #6
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1994 530i  [4.25]
2007 335i Coupe  [4.07]
NO! Do not add Seafoam (or any top engine cleaner) to the intake manifold of a diesel engine as there is a good likelihood of hydro-locking the engine. Compression in Diesels is very high, and there is very little tolerance for adding a non-metered liquid in there along with the air.

You can add to the crankcase or fuel tank safely, but that will not clean the intake valves obviously.
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