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A light viscosity engine oil formulation has been developed based on an extension of the synthesized hydrocarbon fluid (SHF) lubricant technology presented in a recent SAE paper by B. J. Miller, et. al. Utilization of these base materials has enabled the formulation of a product, designated XRN 1669, which provides a significant improvement in both fuel economy and oil consumption control. A combined improvement in these two performance areas has not been attainable in the past with conventional mineral oils. In addition to fuel and oil economy, other critical areas of performance are investigated, including engine cleanliness, wear protection and cold starting capability, as well as ONRI and exhaust emission effects. The superior performance of XRN 1669 compared to premium quality multiviscosity mineral oil products is documented in extensive laboratory, engine and field tests.

Unique performance advantages for polyalphaolefin (PAO) based synthetic engine oils have been documented since the mid-70's (1). The superior performance of these lubricants led the industry to develop improved mineral-based lubricants, including those produced by isomerization of waxes. Recently, an extensive research project was initiated to further enhance the performance advantages of PAO-based synthetic engine oils compared to highly refined mineral oils. A new generation of synthetic lubricant was developed delivering significantly improved performance in all areas. Although the development took place before the introduction of the API “SH” engine oil category, this new synthetic engine oil technology far exceeds API “SH” requirements as well as the API “CD” diesel performance specification. This paper discusses the standard and extended-length (U.