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yup, forgot about the crush washer, I will definately drain the block when I do the water pump change..
so I will go with OEM expansion tank, I will most likely go with OEM thermostat and housing too, its only about $50 more for both items to get OEM BMW anyway.
Belt and tensioner/idler pulley were replaced last winter, but I will double check them when I have everything apart.
should I replace the water pump pulley?
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