Miller, T., Van Dam, W., and Parsons, G., "Recent Developments in GF-6, the New North American Gasoline Engine Oil Performance Category: Part 1: The New J300 Viscosity Grade; Implications and Formulation Trade-offs," SAE Technical Paper 2012-01-1707, 2012, doi:10.4271/2012-01-1707.
New engine technologies are constantly being developed and introduced in order to meet increasing customer demands and government regulations. In many cases, improved engine oil performance is necessary to facilitate the implementation of new engine technologies. In order to meet increasing customer demands for performance, durability, and fuel economy, the engine builders are introducing hardware and operating cycles that place increasing demands on the engine oil.Each new North American Gasoline Engine Oil Performance Category has been developed with specific performance targets and improvements in mind. This paper will primarily focus on the initial steps in the development of engine oils for the GF-6 passenger car engine oil category in North America.GF-6 is scheduled to be introduced during the 1st quarter of 2015 and will supersede GF-5 and previous categories. It will also be backward compatible and will provide improved performance relative to GF-5 in many respects. Changes from GF-5 will include replacements for the Sequence IVA, IIIG, and VG engine tests as well as the addition of a new viscosity grade (representing an HTHS 150°C of 2.3 cP) and increased fuel economy limits. This paper will first review the industry structure in place for category development. Subsequently, implications of the use of ultra-low viscosity lubricants will be discussed. Finally, data will be presented showing current research around the new viscosity grade.