that is normal. when the pistons come down, they compress the air underneath them. but in a tight closed crank case this compressed air could not make way for the pistons. so there is a small rubber pipe going into the air breather. there the small amount of oil (coming with the compressed air)is beeing sucked in again into the cylinders and are burned. its a circle due to regulatins for motorised vehicules. same with most of the new m3w`s. but no harm is done.
cheap solution: exchane the short rubber pipe and put on a longer but thinner one on to the crank case. on the end of this new pipe, put on an small oilfilter and hang it downwards with it. period.
Last edited by swissghost; 04/05/14 08:46 AM.