Revain listed this as fitting my car and it was the wrong part number. Lots of coolant splatter from the expansion tank when used on a BMW coolant expansion tank. Part #17-11-7-573-751 has the wrong depth of about 0.75mm and will never seal properly. This is a good quality item so I gave it 4 stars and kept it to myself; I removed the new o-rings from this new cap and put them on my old cap and all the leaks stopped. My car is a Z4 3.0si with manual transmission and N52 engine (E85 model). 17-11-7-639-022 is the correct part number for the N52 3.0 engine with manual transmission.
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