A typical 10W-30 runs about 68 cP at 40°C, 10.5cP at 100°C. John On Mar 31, 2005, at 10:06 PM, Gene Waugh wrote: > So what, Dr. John, is the viscosity, in centipoises, of automotive oil? > > Gene Waugh > Elgin, Illinois USA John Culp Bristol, Tennessee, USA