Guardol FE®Diesel Engine Oil with Liquid Titanium®

Premium Synthetic Blend API FA-4 Diesel Engine Oil; Formulated for Fuel Economy

Phillips 66®Guardol FE (Fuel Economy) Diesel Engine Oil with Liquid Titanium protection additive is a premium quality, part-synthetic API FA-4 engine oil developed for fuel economy benefits in 2014 and newer engines.

Features & Benefits

  • Excellent protection for newer low-emission diesel engines
  • Specially formulated to protect exhaust aftertreatment systems
  • Exclusive Liquid Titanium protection additive provides enhanced oxidation resistance and protection against engine wear
  • Outstanding soot control for protection against abrasive wear and soot-induced oil thickening
  • Outstanding resistance to viscosity and thermal breakdown at high temperatures
  • Protects against sludge and varnish formation
  • Protects against rust and bearing corrosion
  • Excellent low-temperature pumpability with soot-laden oil
  • High shear stability
  • Good resistance to foaming and aeration


  • On-highway diesel trucks where additional fuel savings are desired.
  • 2010 and newer Detroit Diesel engines (1)
  • 2014 and newer Cummins, PACCAR, Navistar, Volvo/Mack engines(1).
  • 1) Based on extensive field testing, Phillips 66 has extended its Limited Product Warranty to cover the use of FA-4 in these engines for on-highway use. Volvo/Mack owners should inquire about specific conditions that may cause temporary low oil pressure.

API FA-4 Products Limited Warranty

We’ve extended our industry-leading limited product warranty to include fleets that use Guardol FE®10W-30 in:

  • All 2010 or newer Detroit Diesel (DTNA) engines
  • All 2014 or newer Cummins, PACCAR, International/Navistar and Volvo/Mack engines

View Warranty

Technical Details

Licenses & Approvals

Guardol FE with Liquid Titanium is licensed or OEM-certified for:

  • API Service FA-4
  • Cummins CES 20087
  • Detroit Diesel DFS 93K223
Additional Details
SAE Grade10W-30
Specific Gravity @ 60°F0.87
Density, lbs/gal @ 60°F7.24
Color, ASTM D15004.1
Flash Point (COC), °C (°F)226 (439)
Pour Point, °C (°F)-40 (-40)
Viscosity, Kinematic
cSt @ 40°C66
cSt @ 100°C9.9
Viscosity Index133
Cold Cranking Viscosity, cP @(°C)5500 (-25)
High-Temp/High-Shear Viscosity, cP @ 150°C3.13
Sulfated Ash, ASTM D874, wt %1
Total Base Number (TBN), ASTM D289610.5
Titanium, wt %0.01
Zinc, wt %0.122