GUARDOL FE® FULL SYNTHETIC DIESEL ENGINE OIL
PREMIUM FULL SYNTHETIC API FA-4 DIESEL ENGINE OIL; FORMULATED FOR FUEL ECONOMY
Phillips 66® Guardol FE (Fuel Economy) Full Synthetic Diesel Engine Oil is a high-quality API FA-4 engine oil designed for fuel efficiency in 2017 and newer engines that require FA-4.
Guardol FE combines top-grade synthetic base stocks with a proprietary low-SAPS additive package, offering superior engine protection in diesel engines specifying FA-4.
This additive package ensures increased protection of critical engine parts despite the lower HTHS requirements of FA-4.
Guardol FE excels in soot dispersancy, protecting against abrasive wear and soot-induced oil thickening while maintaining good low-temperature pumpability, even with highly soot-laden oil. It offers excellent bearing corrosion protection and guards against sludge and varnish formation.
Additionally, its synthetic formulation enhances thermal stability at high temperatures and improves low-temperature properties compared to conventional diesel engine oils.
Meeting or exceeding the performance requirements of API Service Category FA-4, SN, Guardol FE is approved under the latest OEM specifications for use in low-emission diesel engines. It's suitable for diesel engines operating on diesel fuels with sulfur content up to 500 ppm.

Links of Interest
Features & Benefits
- Excellent protection for newer low-emission 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
- 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
Applications
- On-highway diesel trucks recommending FA-4 to meet 2017 emissions standards
- Mixed fleets with diesel and gasoline fueled vehicles
Technical Details
Licenses & Approvals:
Guardol FE is licensed or OEM-certified for:- API Service FA-4, SN
- Cummins CES 20087
- Detroit Diesel DFS 93K223
Additional Details:
SAE Grade | 5W-30 |
Specific Gravity @ 60°F | 0.854 |
Density, lbs/gal @ 60°F | 7.11 |
Color, ASTM D1500 | 3.4 |
Flash Point (COC), °C (°F) | 226 (439) |
Pour Point, °C (°F) | -45 (-49) |
Viscosity, Kinematic | |
cSt @ 40°C | 57 |
cSt @ 100°C | 9.9 |
Viscosity Index | 155 |
Cold Cranking Viscosity, cP @(°C) | 5060 (-30) |
High-Temp/High-Shear Viscosity, cP @ 150°C | 3 |
Sulfated Ash, ASTM D874, wt % | 0.95 |
Total Base Number (TBN), ASTM D2896 | 10.1 |
Zinc, wt % | 0.0823 |