Goodyear Ultime CNG OIL SAE 20W50 API SG/CF-4/CF is a multipurpose, multi-grade engine oil made to meet Gasoline, Diesel and CNG engine requirements. These oils are also recommended for high-speed, four-stroke diesel/ gasoline engines needing low ash content. These oils can be used in place of SF, CD, CE, oils and are suitable for Mid-SAPS application.