When I have bought filters from DMGRS on here, there is always a washer with it in the box, so I use it.
Related question:
Do people torque to the recommended tightness, 25 nm? I do, but wondered how critical it is. Couple of times on first oil change I've done on a car, oil plug has been extremely tight (by previous owner or a garage), needing huge force to undo. But why over-tighten, with risk of damaging sump thread?
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