Perhaps Pennzoil was the first to make muti grade in this form of oil.. but it seems its been available even valvoline has it. HDAX® 7200 Low Ash Gas Engine Oil HDAX 7200 Low Ash Gas Engine Oil SAE 40 is the next generation of HDAX high performance gas engine oils. Recommended for four-stroke and selected two-stroke stationary engines, HDAX 7200 provides outstanding oxidation and nitration resistance along with outstanding wear and deposit control for engines operating under high load, high temperature conditions. HDAX 7200 helps extend drains and equipment life for improved reliability and productivity. It is also recommended for high-speed four-stroke gas engines used in cogeneration applications and for engines fueled by synthetic gas. HDAX Low Ash Gas Engine Oil Recommended for four-stroke and selected two-stroke stationary engines, HDAX Low Ash Gas Engine Oils provide excellent oxidation and nitration resistance for engines fueled by natural or synthetic gas. Chevron HDAX LFG Gas Engine Oil A premium quality, medium ash, dispersant/detergent type gas engine oil formulated especially for landfill gas and sour gas applications. Chevron HDAX Ashless Gas Engine Oils Recommended for two-stroke and selected four-stroke stationary engines that require an ashless-type engine oil and use natural or synthetic fuel gas. For information about other products that may be available for your industry, in your region, please contact us. Printable Version Also schaeffer oil Co read http://www.schaefferoil.com/engine-oils.html New & Improved Natural Gas Engine Oils Synthetic Plus Sour Gas Engine Oil A superior medium ash Para-Synthetic natural gas engine oil specially formulated for use in medium to high speed, four-cycle gas engines running on landfill gas or sour gas. Synthetic Plus Compressed Natural Gas (114CNG) Synthetic Plus CNG Engine Oil SAE 15W-40 is blended from a unique combination of the finest quality severely hydrotreated polyalphaolefin (PAO) synthetic base fluids and severely hydrotreated and hydrocracked Group II Plus available. Synethetic Plus Natural Gas (114S) Synthetic Plus Natural Gas Engine Oil SAE 30 & 40 is blended from the finest severely hydrotreated polyalphaolefin (PAO) synthetic base fluids and high viscosity index solvent refined severely hydro-finished 100% paraffin base stocks and available.