El Mar®Mid Ash Supreme GEO

Mid-Ash NaturalGas Engine Oil

Phillips 66®El Mar Mid Ash Supreme GEO is a premium 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

• Field-proven performance in providing outstanding engine cleanliness

• Proven performance in lean-burn engines

• High dispersancy protects against engine sludge and varnish deposits

• Excellent resistance to oil oxidation and nitration

• Protects against scuffing and wear

• Protects against rust and corrosion

• Protects against valve stem deposits and valve recession

• Compatible with emissions system catalysts

• 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 specifies a mid-ash gas engine oil

Technical Details

Licenses & Approvals

El Mar Mid Ash Supreme GEO is recommended for use in natural gas engines manufactured by:

• Colt-Fairbanks Morse

• Cooper Superior

• Nordberg

• Waukesha

Additional Details
SAE Grade40
Specific Gravity @ 60°F0.894
Density, lbs/gal @ 60°F7.45
Color, ASTM D15008
Flash Point (COC), °C (°F)225 (437)
Pour Point, °C (°F)-24 (-11)
Viscosity, Kinematic
cSt @ 40°C146
cSt @ 100°C14.4
Viscosity Index96
Cold Cranking Viscosity, cP @(°C)---
Sulfated Ash, ASTM D874, wt %1
Total Base Number (TBN), ASTM D28968.2
Phosphorus, wt %0.028
Zinc, wt %0.032