I meant mostly air.
My sportster is dry sump. When I hotrodded it if you kept the rpms up around 5k or more the rocker box area would fill up with oil and go out the breather and get all in the air filter and then run down the side of the bike. A Pro One (I think) pump with a bigger scavenge side pump fixed it. It seems that everything that is hotrodded needs oil system upgrades. That pump cost 500.00 but it was worth it.