Two examples
So the gases coming from the crankcase to the intake, pass from this small tank.
The oil that is contained get's liquified (which you can drain every now and then).
So... this oil doesn't go in the intake of your car, the cylinderhead, the pistons etc etc.
I run one in my R1 (Yamaha racing part).
I think I will get one for the CSL.
I would be surprised if the guys that race the CSLs, don't have one.
PS : I have heard all kinds of myths, that engines blow up, they don't have lubrication in the combustion chamber etc.
My R1 is still alive and kicking ;-)