Synthetic Polyalkylene Glycol-Based Industrial Gear and Bearing Oil

Phillips 66® PHILSYN PG Gear Oil is a premium quality, synthetic, polyalkylene glycol (PAG) based fluid developed for use in enclosed gearboxes, bearings and compressors where severe conditions demand the unique properties of these lubricants.

You are currently viewing PHILSYN® PG GEAR OIL

Features & Benefits

  • Outstanding oxidation resistance and thermal stability at high temperatures
  • High viscosity index and low pour point for use over a wide temperature range
  • High film strength for wear protection
  • Excellent lubricity compared to mineral-based products
  • Protects against rust and corrosion
  • Extended service intervals compared with petroleum-based lubricants
  • Compatible with commonly used seals, gaskets, and hoses(1)

    (1)Note: PHILSYN PG Gear Oil is not compatible with petroleum oils. Care should be taken to avoid mixing the two products. When switching over from mineral oil to PHILSYN PG Gear Oil, a complete flush, drain, and refill should be performed.

    PHILSYN PG Gear Oil is compatible with neoprene, silicone rubber, torlon, vespal and viton, as well as epoxy paints. It is not compatible with oil-based paints or with solvents, such as diesel fuel, kerosene, heptane, methanol, ethylene glycol or triethanolamine.


  • Enclosed gearboxes operating in extreme or unfavorable conditions
  • Worm gears operating in severe service
  • Reciprocating gas compressor cylinder lubricant where hydrocarbon gas dilution is a problem

Technical Details

  • 320
  • Licenses & Approvals


    Additional Details

    ISO Grade 320
    Specific Gravity @ 60°F, ASTM D4052 1.06
    Density, lbs/gal @ 60°F, Calculated 8.83
    Color, ASTM D1500 <0.5
    Flash Point (COC), °C (°F), ASTM D92 271 (520)
    Pour Point, °C (°F), ASTM D5950 -45 (-49)
    Kinematic Viscosity, ASTM D445
    cSt @ 40°C 318
    cSt @ 100°C 54.2
    Viscosity Index. ASTM D2270 237
    Acid Number, mg KOH/g, ASTM D974 0.2
    Copper Corrosion, 24hrs. @ 100°C, ASTM D130 1B
    Rust Test, ASTM D655 Pass
    Foam Test, Seq. I, tendency/stability, mL, ASTM D892 0/0
    Foam Test, Seq. II, tendency/stability, mL, ASTM D892 0/0
    Foam Test, Seq. III, tendency/stability, mL, ASTM D892 0/0
    Four-Ball Wear, 40kg, 1200 rpm, 75°C, 1 hr, mm, ASTM D4172 0.36
    FZG Scuffing Test, Passing Load Stage, ASTM D5182 12+
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