Premium, Next-Generation GEO for landfill and digester fuel

Phillips 66®El Mar LF-D (landfill-digester) GEO is a premium quality, next-generation, low-ash, gas engine oil designed for landfill gas applications. It is especially effective in controlling silica deposits formed during the combustion of siloxane gases found in many landfills.

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Features & Benefits

  • Proven extended-drain capability for reduced maintenance costs and maximum productivity
  • Field-proven performance in providing outstanding engine cleanliness
  • High dispersancy protects against sludge and varnish formation
  • Outstanding resistance to oil oxidation and nitration
  • Enhanced protection against piston scuffing and ring and liner wear
  • Excellent protection against rust and corrosion
  • Compatible with emissions system catalysts


  • Turbocharged, lean-burn and naturally aspirated 4-stroke cycle and some 2-stroke cycle natural gas engines where the manufacturer specifies a lowash gas engine oil meeting API CF or API CD performance requirements
  • Gas engines burning landfill gas containing hydrogen sulfide

Technical Details

Licenses & Approvals

El Mar LF-D GEO is recommended for use in natural gas engines manufactured by:

  • Caterpillar
  • GE Jenbacher
  • Wartsila
  • Waukesha
Additional Details
SAE Grade40
Specific Gravity @ 60°F0.885
Density, lbs/gal @ 60°F7.38
Color, ASTM D15002.5
Flash Point (COC), °C (°F)274 (525)
Pour Point, °C (°F)-17(7)
Viscosity, Kinematic
cSt @ 40°C125
cSt @ 100°C13.5
Viscosity Index102
Cold Cranking Viscosity, cP @(°C)---
Sulfated Ash, ASTM D874, wt %0.5
Total Base Number (TBN), ASTM D28966.2
Phosphorus, wt %0.029