OLYMPIA Partly synthetic Truck-Tech Diesel Engine Oil SAE 10W-40 (partly synthetic) is an Extremely high performance partly synthetic engine oil.Specially designed to exclusively protect modern high performance diesel engines of Heavy-loaded trucks (Off-Roads). Designed using high performance base oils to reach perfect low temp fluidity, high temp viscosity and decreased fuel consumption. These base oils combine with advance additives to allow for the highest protection of all engine parts. Designed to provide maximum change intervals in modern diesel engine. Used in naturally aspirated and turbocharging diesel trucks.