Summit Syngear PG Series synthetic lubricants are polyglycol-based products for use in enclosed gear, bearings, and compressors where conditions demand the unique properties of these fluids. Better wear protection, thermal and oxidation stability, and reduced sludge and deposit formation insure enhanced performance when compared to petroleum-based lubricants. The Syngear PG Series lubricants are incompatible with petroleum oils. Care should be taken to make sure the two types of fluids are not mixed.