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      11-25-2021, 03:02 PM   #21
Kano
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Drives: BMW M340i
Join Date: Oct 2021
Location: Essex

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Agree, that goes back to my original query on why is it not recommended on a 40i B58.

Perhaps the higher tune, engine strain and expected driving styles on the M3/4 cars.

Regardless of BMW R&D & commercial appeal maintenance sweet spot.
It seems when people that have carried out early changes, confirm the metal fines, which are detrimental to engine wear.

IMO this is acceptable in the BMW warranty vs service intervals for the M “lights”

As my dealers response, not recommended, but it does make me think if leaving the metal in would this have abrasive effects that would potentially only become apparent after the warranty period is over.
Appreciate 0