# LBPH778968

Premium Full Synthetic API CK-4 Diesel Engine Oil; Fortified with Liquid Titanium Protective Additive

Phillips 66® Guardol XT Full Synthetic Diesel Engine Oil, formerly known as Triton ECT or Triton Arctic, is a premium quality, full-synthetic engine oil developed for use in 4-stroke cycle diesel engines operating under extreme temperature conditions. It meets API CK-4 performance requirements for use in modern low-emission engines designed to meet 2007 and later EPA on-highway exhaust emissions standards, and is backward serviceable for use in older diesel engines. It is specially formulated for compatibility with exhaust aftertreatment systems using diesel particulate filters (DPF), diesel oxidation catalysts (DOC) and/or selective catalytic reduction (SCR). The full-synthetic formulation provides excellent low-temperature properties for better performance in harsh winter climates.

Features & Benefits

  • Excellent protection for newer low-emission diesel engines and older diesel engines
  • Specially formulated to protect exhaust aftertreatment systems
  • Outstanding soot control for protection against abrasive wear and soot-induced oil thickening
  • Outstanding resistance to viscosity and thermal breakdown at high temperatures
  • Exclusive Liquid Titanium protection additive provides enhanced oxidation and wear control
  • Protects against rust, bearing corrosion and wear
  • Excellent low-temperature pumpability for easier starting and less wear during cold starts
  • High shear stability
  • High resistance to foaming and aeration


  • On- and off-highway diesel equipment operating at low ambient temperatures
  • 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
  • Mixed fleets with diesel and gasoline-fueled vehicles

Licenses & Approvals

Guardol XT Full Synthetic Diesel Engine Oil is licensed, registered or approved for:

  • API Service CK-4, CJ-4, CI-4 PLUS, SN
  • Cummins CES 20086
  • Detroit Diesel DFS 93K222
  • Deutz DQC III-10
  • Mack EOS 4.5, Volvo VDS 4.5
  • Mercedes-Benz Sheet 228.31
  • Renault VI RLD-4
  • Ford WSS-M2C171-F1


Guardol XT Full Synthetic meets or exceeds the requirements of:

  • ACEA E9-08, E7-08
  • Caterpillar ECF-3, ECF-2, ECF-1-a
  • Diesel engines manufactured by OEMs not listed above, where the OEM specifies API CK-4 engine oil

Additional Details

SAE Grade 5W-40
Specific Gravity @ 60°F 0.855
Density, lbs/gal @ 60°F 7.12
Color, ASTM D1500 4
Flash Point (COC), °C (°F) 240 (464)
Pour Point, °C (°F) -48 (-54)
Viscosity, Kinematic
cSt @ 100°C 14.5
cSt @ 40°C 96
Viscosity Index 166
Cold Cranking Viscosity, cP @ -30°C 6230
High-Temp/High-Shear Viscosity, cP @ 150°C 4.2
Sulfated Ash, ASTM D874, wt % 1
Total Base Number (TBN), ASTM D2896 10.2
Titanium 0.01
Zinc, wt % 0.1288

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