"Castrol® GTX® Diesel 15W-40 is a multipurpose heavy duty diesel engine oil designed to provide superior protection. Conforming to the strict requirements of PC-11 engine oil technology, it can be used in diesel engines where API CK-4, CJ-4 and below is required. It is engineered to help provide long and healthy engine life, giving you peace of mind that your diesel engines are protected in a variety of applications and duty cycles.
Protects against oil thickening and deposit build up in critical engine parts
Better shear stability and protection against viscosity loss for reliable engine protection
Protects from wear and deposits
Ideal for use in mixed fleets enabling product rationalization for workshops and mixed fleets, thus lowering their stock costs"