It leaked because Purolator, and many other brands, made a change last year to the threaded area which used to be Concave (bowed inward) to now they are Convex (bowed outward) that is why they will leak now. The convexed thread area won't allow the filter to screw down tight enough due to interference from the nipple nut.
If you get lucky and find some old stock on the shelf, look at it carefully. If the thread area is concave grab it and use it.