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Engine Oils Product Data castrol.com/GPS 800 255 4417 May 2025 GPS Castrol ® Duratec ™ LFG 40 Low Ash Natural Gas (landfill) Engine Oil Castrol Duratec LFG is a low ash 40 weight natural gas engine oil designed to provide superior performance and protection for stationary natural gas engines running off landfill gas. Castrol Duratec LFG provides the potential for extended drain intervals and lower oil consumption while extending head life. e primary application for Castrol Duratec LFG is for stationary high speed 4 stroke engines using landfill gas. Real World Testing Castrol Duratec LFG 40 was developed to deliver exceptional real world results for natural gas engine operators looking to maximize their uptime and increase their operational efficiency. Please visit Castrol Duratec LFG 40's White Paper to review the outstanding real world test results. Oil Consumption Castrol Duratec LFG 40 is formulated with high quality, hydrocracked base stocks and an exclusive additive package that decreases oil consumption. Reducing oil consumption delivers savings to the bottom line and can extend engine life. With Castrol Duratec LFG 40's low volatility rate, daily oil consumption rates were decreased when compared to a standard natural gas engine oil, leading to lower carbon deposits le behind by oxidized oil. When compared to standard Group I natural gas engine oils, Castrol Duratec LFG 40 reduces daily oil consumption up to 50%, leading to cleaner engines and less carbon build-up. Acid Neutralization and Oxidation and Nitration Control Natural gas engine oils need to protect against higher combustion temperatures versus diesel and gasoline engines, with excellent acid neutralization and oxidation and nitration control. Castrol Duratec LFG 40's excellent TBN efficiency effectively neutralizes harmful acids. It also provides outstanding oxidation and nitration suppression throughout extended drain intervals, preventing sludging, varnishing, plugged filters, deposits and prematurely thickened oil. Valve and Wear Protection Extended drain intervals should not sacrifice engine protection. With Castrol Duratec LFG 40's advanced anti wear package, drain intervals are safely extended while maintaining or decreasing wear rates, protecting against metal to metal contact and extending engine life. Further, Castrol Duratec LFG 40 provides excellent valve protection by protecting against excessive valve recession and worn valve seats to extend cylinder head life. B21 ecastrof