Phillips 66® El Mar W GEO is a high-quality, mid-ash, dispersant-detergent gas engine oil designed for use in naturally aspirated and moderately to highly turbocharged 4-stroke cycle natural gas engines. It is particularly recommended for use in natural gas engines and dual-fuel engines burning sour gas or landfill gas.

You are currently viewing EL MAR® W GEO

Features & Benefits

  • Excellent resistance to oxidation and nitration
  • High alkaline reserve to combat acidic combustion by-products when burning sour gas
  • High dispersancy protects against sludge and varnish formation
  • Protects against scuffing and wear
  • Protects against rust and corrosion
  • Excellent low-temperature performance
  • Does not contain any bright stock, which can cause harmful carbon deposits


  • 4-stroke cycle gas and dual-fuel engines burning sour gas or landfill gas
  • 4-stroke cycle gas engines in wastewater treatment plants fueled by digester gas
  • 4-stroke cycle converted irrigation engines running on natural gas or LPG
  • Other 4-stroke cycle natural gas engines where the manufacturer specifi es a mid-ash gas engine oil

Technical Details

  • 30/40
  • Licenses & Approvals


    Additional Details

    SAE Grade 30/40
    Specific Gravity @ 60°F 0.881
    Density, lbs/gal @ 60°F 7.34
    Color, ASTM D1500 3
    Flash Point (COC), °C (°F) 240 (464)
    Pour Point, °C (°F) -30 (-22)
    Viscosity, Kinematic
    cSt @ 40°C 132
    cSt @ 100°C 14.1
    Viscosity Index 104
    Sulfated Ash, ASTM D874, wt % 0.94
    Total Base Number (TBN), ASTM D2896 9
    Phosphorus, wt % 0.079
    Zinc, wt % 0.088
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