T5X®PLUS Heavy Duty Diesel Engine Oil

Heavy-Duty Monograde Diesel Engine Oil

Phillips 66®T5X PLUS Heavy Duty Diesel Engine Oil is a high-quality diesel engine oil designed for use in off-highway diesel equipment, farm machinery, marine engines and mixed commercial fleets.

Features & Benefits

• Excellent soot control for protection against abrasive wear and soot-induced oil thickening

• Protects against sludge and varnish formation

• Protects against scuffing and wear

• Protects against rust and bearing corrosion

• Good resistance to foaming and aeration


• Off-highway trucks, heavy equipment and farm equipment

Technical Details

Licenses & Approvals

T5X Heavy Duty meets or exceeds the requirements of:

  • Former API Service CF
  • API Service SL
Additional Details
SAE Grade40
Specific Gravity @ 60°F0.879
Density, lbs/gal @ 60°F7.32
Color, ASTM D15004
Flash Point (COC), °C (°F)235 (455)
Pour Point, °C (°F)-36 (-33)
Viscosity, Kinematic
cSt @ 40°C142
cSt @ 100°C15.3
Viscosity Index110
High-Temp/High-Shear Viscosity, cP @ 150°C4.2
Sulfated Ash, ASTM D874, wt %1.39
Total Base Number (TBN), ASTM D289610.5
Zinc, wt %0.119