Polypropylene oligomers were used to formulate two‐stroke (2T) engine oil for once‐through lubrication systems, to enhance the exhaust emission characteristics of two‐stroke engines. The oligomers alone are suitable from a stability viewpoint, but must be reinforced with polyol‐ester components to have good load‐carrying capability. Both ash‐forming and ash‐free commercial additive packages can be used to formulate the end‐product. The exhaust stream includes the unburnt portion of the fuel:oil mixture. The lubricating oils formulated on polypropylene oligomer base do not contain polynuclear aromatics, the sulphur‐dioxide emission is due to the sulphur content of the fuel and additive (if any). On a bench test, the hydrocarbon emission was significantly lower using polypropylene oil, in comparison to using a commercial mineral‐oil‐based composition.
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