Diesel Engine Oils

Castrol®’s premium line of diesel engine oils combines exceptional base stocks and additive technologies that provide the performance and protection your heavy-duty equipment deserves.

New developments in diesel engines have led to lower emissions in heavy-duty vehicles. These new technologies can make as much as 30% higher torque—but they also bring higher engine temperatures and pressures.

This can lead to accelerated oxidation and oil thickening, increased build-up of deposits and rapid depletion of the oil’s acid-controlling reserves. All of this can push the oil closer to breakdown and reduce useful oil life.

Castrol’s high-quality diesel engine oils are formulated to perform a number of roles in response to today’s engine advances. They can reduce frictional resistance and protect against corrosion and wear, assist in sealing, contribute to cooling the engine, and facilitate the suspension of harmful combustion by-products.