GULFCO 1049 Max 20W-50 is a premium quality low ash mobile gas engine oil exclusively developed for Compressed Natural Gas (CNG) Engines of Ashok Leyland vehicles meeting BS III and BS II emission norms. It is blended from high quality base oils and carefully selected additives to provide exceptional control of oil oxidation and nitration, a common problem encountered in natural gas engines. This oil is designed for modern high output, high speed, lean burn natural gas engines which place severe demands on the engine lubricant.