[KTL]

I'll add that the volume of oil discharged by the crankcase breather can be a major amount of oil that no catch can is able to hold. It's so much oil that it must be returned to the tank. It's also very advisable that the hose from the crankcase breather is humped upward to use gravity to limit the amount of oil that the engine pukes out. Basically at lower rpms the oil can climb up the hose and then slide back back to the crankcase. But at sustained high rpms that oil will keep coming and go all the way to the tank.

In racecars that have a forward mounted tank in the trunk's smuggler's box, the crankcase breather hose is typically routed along the roof line (usually strapped to the roll cage tubing) and that helps limit the amount of oil discharge. Even with the high routing, it still spits a bunch of oil into the tank. I've heard racers that use the clear fiber-reinforced hose say they're shocked how much oil they can see going thru that hose.