Industrial Oils

Guardol FE® Diesel Engine Oil with Liquid Titanium®

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.

Guardol FE® Diesel Engine Oil with Liquid Titanium®


  • 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.