Kendall Super-D NG 15W-40 is Natural Gas Engine Oil for vehicular applications. Kendall Super-D series is a premium engine oil line manufactured by Phillips 66 Lubricants. "NG" refers to "Natural Gas" because it is specially formulated for use in vehicles that run off compressed natural gas (CNG) and liquid natural gas (LNG). 15w-40 is the thickness of the oil based on Society of Automotive Engineers (SAE) standards. 

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