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I think the German Government has very strict requirements for recycling. I don't know the details or whether plastics have an easier path to satisfying them than metals do but BMW for sure has been making parts from plastic that would have been made of metal. Some of these plastic (if not all of them)parts failed much sooner than the metal parts they replaced. BMW water pumps were notorious for this and aftermarket replacements are available but you must have them installed by other than a BMW dealer.
I might just let a leaky plastic oil pan pollute my garage floor.
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