Firebird®Heavy Duty EC Diesel Engine Oil

API CK-4 Diesel Engine Oil Formulated with Re-refined Base Stocks

Phillips 66®Firebird Heavy Duty EC (Emission Control) Diesel Engine Oil is an environmentally responsible API CK-4 engine oil developed for use in four-stroke cycle diesel engines designed to meet 2007 and later EPA on-highway exhaust emissions standards. It is specially formulated for compatibility with exhaust aftertreatment systems using diesel particulate filters (DPFs), diesel oxidation catalysts (DOCs) and/or selective catalytic reduction (SCR). It is backward serviceable for us in pre-2007 diesel engines.

Features & Benefits

  • Excellent protection for newer low-emission diesel engines and older diesel engines
  • Specially formulated to protect exhaust aftertreatment systems
  • Protects against particulate filter plugging
  • 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
  • Protects against rust, bearing corrosion and wear
  • Good resistance to foaming and aeration
  • Lessens the environmental impact of used oil disposal


  • On-highway diesel trucks equipped with EGR and exhaust aftertreatment systems to meet 2007/2010 emissions standards
  • Older diesel equipment with conventional, non-EGR engines or ACERT engines
  • Off-highway construction, earth moving and mining equipment

Technical Details

Licenses & Approvals

Firebird Heavy Duty EC is licensed or OEM-certified for:

  • API Service CK-4, CJ-4, CI-4 PLUS, SN
  • Cummins CES 20086
  • Detroit Diesel DFS 93K222
  • Ford WSS-M2C171-F1

Firebird Heavy Duty EC meets or exceeds the requirements of:

  • Caterpillar ECF-3, ECF-2, ECF-1-a
  • Mack EOS 4.5
  • Mercedes-Benz Sheet 228.31
  • Volvo VDS-4.5
  • Diesel engines manufactured by OEMs not listed above, where the OEM specifies API CK-4 engine oil
Additional Details
SAE Grade15W-40
Specific Gravity @ 60°F0.8774
Density, lbs/gal @ 60°F7.31
Color, ASTM D1500L 4.0
Flash Point (COC), °C (°F)235 (455)
Pour Point, °C (°F)-31 (-24)
Viscosity, Kinematic
cSt @ 40°C111
cSt @ 100°C15
Viscosity Index139
Cold Cranking Viscosity, cP @ -20°C5400
High-Temp/High-Shear Viscosity, cP @ 150°C4.2
Sulfated Ash, ASTM D874, wt %0.99
Total Base Number (TBN), ASTM D28969.7
Zinc, wt %0.125
Re-refined Content, Finished Oil, vol %100