El Mar®W GEO

Mid-Ash NaturalGas Engine Oil

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.

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

Licenses & Approvals
Additional Details
SAE Grade30/40
Specific Gravity @ 60°F0.881
Density, lbs/gal @ 60°F7.34
Color, ASTM D15003
Flash Point (COC), °C (°F)240 (464)
Pour Point, °C (°F)-30 (-22)
Viscosity, Kinematic
cSt @ 40°C132
cSt @ 100°C14.1
Viscosity Index104
Sulfated Ash, ASTM D874, wt %0.94
Total Base Number (TBN), ASTM D28969
Phosphorus, wt %0.079
Zinc, wt %0.088