When it comes to engine oil, fleet owners face a dilemma. They want the greater fuel efficiency that lower-viscosity oil can offer, but they’re concerned that it won’t provide the durability and wear protection of higher-viscosity oils. Learn how Delo 400 SD SAE 15W-30 diesel oil combines low viscosity with engine protection by providing additives that help protect oil from oxidation that can lead to engine wear. From Chevron