I got the same smell start from late 2023, it begin with losing coolant and refiled every other week and got worse and worse. it`s too hard to get a loaner car appointment, I waited for 2 week until the scheduled time. BMW quoted $3,800 for the repairs. on my car it is the oil filter housing leaked. few other hose was required to replaced at the same time. I have replaced 5 coolant hoses in 2023, now the filter and could be more. none of the hoses are covered under extended warranty. It`s really disappointing. BMW reliability are destroyed again by these shitty cool components.
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