Hi Guy A Triumph oil pump will not wet sump due to the plunger construction, BSA gear pumps do! I find that when I use 20/50 grade oil it will wet sump quite a bit but a monograde 40 or 50 lessens the problem. I have an SRM sump plate with drain plug and, although it's a pain, just drain into a clean container & pour back into the oil tank. If you do not, most of your oil will end up on the road, coming out through the breather.