The Petro-Canada Lubricants Duron Advanced 5W-30 engine oil is a fully synthetic formulation designed to meet API FA-4 requirements. The Duron Advanced product line offers durable low viscosity, high performing synthetic, and synthetic blend heavy duty diesel engine oils that are designed for emerging and future fuel-efficient engines. These oils provide enhanced fuel economy, durability, engine protection, and shear stability for the latest heavy duty engines, says the company.