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.
Bought a oil filter from a dealer in Oklahoma city back in 06 for the Bonneville. Got home and peeled the truimph sticker off and guess what was under the sticker? WIX. Felt like a **** fool. Could have drove about five miles not 94 miles and bought the same **** thing. Guess who uses the same filter as the Bonneville? The Rocket.
I have noticed a difference in the Wix and 'Triumph' filter; This is the Wix 51358 compared to the Triumph T1218001. Note the lack of blow by valve and slight height difference. Would like to cut them open and compare the medium. For the cost of $s or $5 dollars every 5k km, I think I will stick with Triumph Genuine. 1st and 2nd image shows package numbers. 3rd shows height. 4th shows Wix left and Triumph right, notice no valve in Wix. 5th shows Wix. 6th shows Triumph.
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