MAK Diamond 15W-40 is a heavy duty diesel engine oil blended from highly refined high viscosity index Group II plus base stocks. It is formulated to perform under the most stringent operating condition for heavy duty diesel engines. It offers outstanding protection against oil degradation, oil thickening and corrosion. This oil has good shear stability and maintains its viscosity even under high shear, high temperature conditions. MAK Diamond 15W-40 provides the highest level of protection for relatively older diesel engines, large or small, non-turbocharged or turbocharged diesel engines requiring added wear protection and prevention of oil loss of a higher viscosity engine oil. MAK Diamond 15W-40 is recommended for use in diesel engines meeting BS I and BS II standards of emission for vehicles such as heavy duty trucks, buses, LCVs, SUVs and diesel passenger cars. It is suitable for diesel engines requiring oils such as CF-4, CF and CD performance. Alternatively be guided by OEM’s recommendation for oil drain period. Mak Diamond 15W40 CF4 Is Available in 20 Litres & 210 Litres Pack.