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Regulations to reduce emissions worldwide are the driving force behind the modifications that OEMs (Original engine manufactures) are making to their engine designs, which in turn drives the need of changes in lubricant requirements. To meet the emission standards, engine makers are turning to after-treatment devices that supplement EGR (Exhaust Gas Recirculation). In the United States, engines are being equipped with DPF (Diesel Particulate Filters), while in Europe SCR (Selective Catalytic Reduction) is favored. In China, technologies of engine design are also intended to meet the stricter regulations of emissions control. But different OEMs tend to favor different technologies depending on their own in-house technologies and that of their partners. So HDEO (Heavy-Duty Engine Oil) marketers in China must qualify their products to meet both API (American Petroleum Institute) licensing standards and individual OEM specifications.

An anti-friction additive was studied in API SM 5W-30 oil. Its tribological performance was evaluated on a four-ball tester, SRV and MTM. This additive has been found to be an effective antifriction additive for lubricants. The investigation indicates that this additive possesses excellent energy saving and reducing friction characteristics in API SM 5W-30 lubricating oil.