Gardner Denver AEON 4000 is a semi-synthetic, severely hydrotreated lubricant formulated with a unique patented anti-oxidant package. It offers outstanding thermal and oxidation stability, while minimizing varnish formation. Life tests indicate a service interval up to three times longer than that of comparable petroleum based lubricants, depending on individual compressor characteristics and ambient conditions. 4000 hour Hydrocracked Mineral Oil Outstanding thermal and oxidation stability Varnish formation minimized Minimizes maintenance and downtime Characteristics of a synthetic in a petroleum blend