Three speeder twins are dry sump, but most two speeder twins are total loss oiling. The oil goes round the internals and then lubricates the road...
Racer twins and folk like me have added a catch tank as one does not want to be cause of unshipment of motorbike riders. What is interesting though is the state of the oil. The oil I put in is golden and reasonably thick, the oil that comes out is as black as ink and noticeably far thinner. About 1000 miles per gallon is what's claimed, although I will be using a bit more as I keep the oil injected at a slightly higher rate as oil is cheap; rebuilds aren't.
