Motor Oils
Heavy-Duty Motor Oils
Premium heavy-duty diesel engine oils from Petro-Canada DURON™ and Phillips 66 GUARDOL®. API CK-4 and FA-4 licensed oils engineered for maximum protection, extended drain intervals, and fuel economy in on and off-highway fleets and equipment.
Heavy-Duty Diesel Engine Oils
Premium protection for on and off-highway diesel engines
DURON™ UHP
Ultra High Performance synthetic engine oils give you ultimate protection and extended drain intervals in the most demanding conditions.
Available Weights:
DURON™ SHP
Super High Performance synthetic blend engine oils offer excellent protection with outstanding value for mixed fleet operations.
Available Weights:
DURON™ HP
High Performance engine oil delivers on performance with proven protection for on and off-highway diesel engines.
Available Weights:
DURON™ Advanced
A fuel saving oil for advanced heavy-duty diesel engines, designed to maximize fuel economy without compromising protection.
Available Weights:
DURON™ GEO
Specially formulated for the high combustion temperatures in today's natural gas mobile engines. Also provides premium performance for heavy-duty diesel and gasoline engines.
Available Weights:
DURON™ EXTRA
A premium heavy-duty diesel engine oil delivering the durability to protect engines through extended drain intervals and tough operating cycles.
Available Weights:
GUARDOL ECT®
GUARDOL ECT® Synthetic Blend Diesel Engine Oil
Emission Compatible Technology synthetic blend diesel engine oil providing premium protection for modern diesel engines with advanced emission systems.
Available Weights:
GUARDOL XT®
GUARDOL XT® Full Synthetic Diesel Engine Oil
A premium full-synthetic diesel engine oil engineered for maximum protection, fuel economy, and performance in the most demanding heavy-duty applications.
Available Weights:
GUARDOL FE®
GUARDOL FE® Synthetic Blend Diesel Engine Oil
Fuel Economy synthetic blend diesel engine oil formulated to improve fuel efficiency while maintaining durable engine protection for mixed fleets.
Available Weights:
GUARDOL Fleet EC®
GUARDOL Fleet EC® Diesel Engine Oil
Emission Compatible synthetic blend API CK-4 engine oil designed for mixed fleets operating under varying conditions.
Available Weights:
GUARDOL® NG-D
GUARDOL® NG-D Natural Gas Engine Oil
High-quality synthetic blend engine oil designed for natural gas engines in heavy-duty transportation and stationary applications.
Available Weights:
Need Help Choosing the Right Diesel Engine Oil?
Our technical experts can help you select the optimal heavy-duty motor oil for your specific fleet, equipment, and operating conditions.