Supermax-50 15W-50 CH-4 is a high ash Multigrade Diesel Engine Oil formulated to meet the needs of pre 2002 American, European and Japanese heavy duty naturally aspirated and turbo charged diesel engines. It meets the same specifications/ performance levels as Supermax-50 15W-40 CH-4 but has been formulated with a higher viscosity for vehicles/ machinery operating under extreme conditions like those experienced in the Australian outback. It  meets the requirements of JASO DH-1 and also exceeds the soot thickening control and valve train wear protection requirements of API CH-4. Supermax-50 15W-50 CH-4 be used where API: CD, CE, CF-4 or CG-4 oils are specified.