I have just found out I have been fitting the wrong oil filter a Mann w79 to
my petrol engine this seams to be for the diesel engined model even though
it is the same size in all respects......I should have been be fitting a
Mann w75/3 .....This has a bypass pressure of 1.3 bar and the diesel one has
a bypass pressure of 2.0......will I have done any damage to my engine given
that the bypass doesn't only operate when the filter is blocked but also
opens when the oil is cold etc.....
Diesels run at higher compression ratios. Although they don't see the
same peak load down the con-rod as during the "bang" of a petrol engine,
they generally use larger big-ends to keep the stress levels on the
white metal down. I can only assume they use different BP pressures for
That said, I wouldn't be panicking that you have wrecked your engine.
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