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Aluminum engine parts discoloration? (archive)

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Posted by Matt on August 07, 2001 at 14:29:37:

Here's a topic I've not seen come up. In my own M30 engine, and in many other Bimmers I've seen pictured online, the engine's large alloy pieces (valve covers, intake runners, etc.) often seem to have an amber colored discoloration all over them. Is this common? If so, what is it and how does one remove it?


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