How about all the oily recirculating air coming from the crankcase vent. Most BPV's I've seen have been pretty clean and oily. That should be sufficient. You have an air filter. James James E. Bufkin, P.E. Bufkin Design and Engineering, inc. 2309 West 8th Street Austin, Texas 78703 512-236-8070 fax 512-480-5927