The main cause is probably the earlier FRAM oil filter being of poor
quality and having a rather high resistance.
That said, 90 psi is very high so is this K&N filter OK and did you try
another?
However I do not think it will cause any harm. For normal use ca.
50-60psi at 2500rpm and a hot engine should be fine in most UK engines,
in race applications it could be higher.
Also, check the accuracy of the oil gauge!
Kees Oudesluijs
[demime 1.01d removed an attachment of type text/x-vcard which had a name of
coudesluijs.vcf]
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