Phillips 66® Heavy Duty Diesel Engine Oil is a high-quality universal fleet engine oil designed for use in on-highway diesel trucks and off-highway diesel equipment operating in moderate to hot climates. It also is recommended for passenger cars and light trucks with either diesel or gasoline engines where the OEM recommends SAE 20W-50 or 25W-50 engine oil.

You are currently viewing HEAVY DUTY DIESEL ENGINE OIL

Features & Benefits

  • Excellent soot control for protection against abrasive wear and soot-induced oil thickening
  • Excellent resistance to viscosity and thermal breakdown at high temperatures
  • Protects against sludge and varnish formation
  • Excellent wear protection
  • High shear stability
  • Excellent rust and bearing corrosion protection
  • Good resistance to foaming and aeration


  • Older diesel equipment with conventional, non-EGR engines
  • Mixed fleets with both diesel and gasoline-fueled vehicles
  • Off-highway construction, earth moving and mining equipment
  • Farm equipment with diesel or gasoline engines

Technical Details

  • 20W-50
  • Licenses & Approvals

    Heavy Duty Diesel Engine Oil is licensed for: #API Service CH-4, SL

    Additional Details

    SAE Grade 20W-50
    Specific Gravity @ 60°F 0.886
    Density, lbs/gal @ 60°F 7.38
    Color, ASTM D1500 L 4.0
    Flash Point (COC), °C (°F) 242 (468)
    Pour Point, °C (°F) -27 (-17)
    Viscosity, Kinematic
    cSt @ 40°C 190
    cSt @ 100°C 20
    Viscosity Index 122
    Cold Cranking Viscosity, cP @ -15°C 9300
    High-Temp/High-Shear Viscosity, cP @ 150°C 4.1
    Sulfated Ash, ASTM D874, wt % 1.39
    Total Base Number (TBN), ASTM D2896 10.5
    Zinc, wt % 0.119
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