Mobil Pegasus 1 15w-40 is a Synthetic Natural Gas Engine Oil. The Pegasus series is a line of premium gas engine oils manufactured by Mobil Lubricants. "1" refers to it being their best full synthetic natural gas engine oil they offer. It is specially formulated for use in a wide range of vehicles as well as generators 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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