Formula 20W/40 : These are superior quality Multigrade Engine Oils made from high quality base stocks and additives. These oils meet performance level of API SF / CC, MIL- L- 46152B &1S: 13656- 1993. These oils ensure outstanding performance and in long design period in new generation petrol and diesel engines. Formula 15w/40: It is designed for heavy duty diesel engines based on blend of high quality,high viscosity index hydro finished base oils and advanced additive package.These oils are used for all automotive high speed four stroke,supercharged and turbocharged diesel enginewhen below performance levels are recommended. CF-4/CF/SJ,MIL-L- 2104E,E2,228.1,TO-2,C-4 Powerzone Ultra HDZX-40: Powerzone Ultra HDZX-40 are superior quality heavy duty, mono grade engine oils and meets API CD / SC, US Military MIL-L-2104 C and Mack T- 7 engine test requirements. These oils are recommended for heavy commercial vehicles, diesel cars including earthmovers & engines operating on fuels with heavy sulphur content. These oils also provide excellent thermal & oxidation stability.