Phillips 66® Guardol FE (Fuel Economy) Full Synthetic Diesel Engine Oil, formerly known as Triton FE is a premium quality, API FA-4 engine oil developed for fuel economy benefits in 2017 and newer engines where FA-4 is specified.
Guardol FE is formulated with the highest quality synthetic base stocks and a proprietary low-SAPS additive package to provide outstanding engine protection in diesel engines specifying FA-4. This additive enhancement provides increased engine protection of critical engine parts, despite lower HTHS requirements of FA-4.