Coolant reservoir leaking again, albeit after 4 years since replacement (from dealer) . This time around I’ll purchase from FCPEuro and never spend again if this damn thing leaks. The last time it leaked I replaced the cap with 80 pressure version but that didn’t help apparently. The prices have gone up significantly. Last time it was around $70 and now $110 . This is original BMW. I might just replace with much cheaper after market since OEM has proven not to be special in this case.

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.