Get advanced wear protection for your diesel engine with Valvoline(TM) Premium Blue(R) 15W-40 Diesel Engine Oil. Blended with superior synthetic base stocks, this motor oil provides faster, safe starts during freezing weather and can help to improve fuel economy. It contains powerful anti-wear agents and anti-oxidants to protect your engine against rust and corrosion. It also features dispersive polymer technology to control soot and maximize durability. This high performance engine oil is designed for modern, emissions treatment equipped diesel engines.