On Monday, 13 May 2019 12:13:46 UTC+1, Jim wrote:

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.....

Start engine, remove filler cap. You should know whether oil is circulating from cold. If not, switch off right away & replace filter. I wuoldn't expect a problem though.


NT