How long has it been running with the "wrong" filter in?
wrong oil filter
May 13, 2019
Last reply: 7 years ago
15 Replies
Think it'll be fine then.
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.
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
that is what I was wondering ....
good idea thanks ....
coming up for four years ......
30,000 miles
good ...I've sent for a few of the specified w75/3 filters anyway.....
you'd have known about it long ago if it weren't passing oil when needed.
NT
= 7,500 miles per year. Why bother with diesel for that mileage ?.
Maybe that?s why he?s running a petrol car?
Tim
I didn't and I have three cars....and an electric moped...tee hee
good somebody who can read....tee hee
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