On Feb 8, 2008, at 7:00 PM, Joseph Tainter wrote: > I'm wondering if anyone knows why a major manufacturer would switch to > lighter-weight oil.
Fuel economy is number one. As long as there is sufficient lubricity to cool the parts and prevent metal to metal contact, a lighter oil produces less drag. A lighter oil might also allow more oil-flow through the engine, permitting better heat dissipation. With synthetics, generally oil carbonization and viscosity loss is greatly reduced so the lighter oils can stand up to as long or longer service life between changes than the older, non-synthetics. Godfrey -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
