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A water pump will fail around 80-120k miles on most cars. BMW is not like most cars and its pump can fail a heck of a lot sooner
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Most cars have metal water pumps. BMW has plastic water pump.
I wonder what is the ratio of 335 with early water pump failure vs N/A models. My thinking is the engine compartment will be hotter with turbo, plastic and heat don't go that well.
I also wonder the ratio of plastic valve cover cracks on turbo vs N/A BMW's.