On 13/05/2019 12:36, Jim wrote:
"Jim" wrote in message
...
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.....

...and why would a diesel and a petrol engine have different inlet and
outlet bypass pressures ?


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
related reasons.

That said, I wouldn't be panicking that you have wrecked your engine.

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