03/06/2026
BMW 320i n20 petrol xdrive, in for a replacement oil pump chain and timing chain due to a whirring noise. This noise is caused by the oil pump chain sometimes sounds like a worn drive belt bearing or even turbo whine. It is caused by the oil pump sprocket and chain due to the way it wears sometimes. Only fix it's to replace the oil pump chain and sprockets. Whilst there it makes sense to replace the timing chain as well. Using a febi chain kit which consists of iwis parts,
Iwis supply chains to BMW so it's basically genuine parts fitted.
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