I've just done a routine oil and filter change on my xflow car.
All is fine, except it seems to be taking a long period (2, 3 seconds?) for the oil pressure to register on the gauge compared to before, when it was almost instantaneous. The car has been given a run, oil pressure behaviour is otherwise fine.
I'm assuming that the new oil filter doesn't have an anti-drain valve, and that the old one did. Unfortunately I took the old one to recycling and I can't remember what it was. Any recommendations for an xflow filter that does have anti-drain? (New one is a motorcraft item, but part number isn't immediately to hand but it was mentioned in the archives as being suitable.)
Alternatively, what might the cause be?
Thanks.