The newer kid on the block, Powerex Scroll oilfree air compressors contain no oil in a crankcase and are much quieter than reciprocating air compressors.  With no oil or oil filter to change, maintenance on this type of air compressor is much easier than a reciprocating air compressor.  The same Powerex quality the market has come to trust in the Powerex Reciprocating compressor has been duplicated in the technologically advanced Powerex Scroll compressor!