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Originally Posted by F32Fleet
Basically what you're saying is if I buy a bad batch of correctly serialized Bosh plugs which damage my engine, BMW will warranty the repairs if my vehicle is within the factory warranty period?
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Yes. It is illegal for BMW to mandate that BMW-branded hardware be used on your car. The only case they can is if they have patented designs/process that they can prove that only they can manufacture due to complex design or whatever. That's why when you look up specs for oil, coolant, plugs, etc. in your service manual, it typically says "or equivalent."