Castrol GTX Diesel 15W-40 is a low ash, multi-grade, diesel engine oil specially formulated for all 4-stroke diesel engines, particularly in naturally aspirated and turbo charged 4WD and light commercial vehicles. Castrol GTX Diesel extends diesel engine life in cars and light commercial vehicles, providing extra protection against diesel engine problems that your engine faces everyday. Castrol GTX Diesel provides exceptional oil consumption control and engine protection wear benefits. Castrol GTX Diesel provides added protection against soot build-up, to help prevent excessive oil thickening and soot related wear. Castrol GTX Diesel 15W-40 meets API CH-4/SJ. It is suitable for cars and light commercial vehicles that specify API CD, CF, CF-4 or CH-4. It is not recommended for use in vehicles fitted with Diesel Particulate Filters or petrol engines with catalytic converters. To find the oil type and viscosity suggested for your vehicle; either check with your manufacturer, your local mechanic or head in-store and talk to one of our friendly team.