Hello everyone. I thought this might be an interesting bit of information that everyone would find useful in prolonging the life of your vehicles engine. 
From - "Synthetic Oil: Rx for Long Engine Life"
http://www.mr2.com/TEXT/synth_oil.txt
"Film strength refers to the amount of pressure required to force out a
film of oil from between two pieces of flat metal. The higher the film
strength, the more protection is provided to such parts as piston rings,
timing chain, cams, lifters, and rocker arms...wherever the lubricant is
not under oil-system pressure. Synthetics routinely exhibit a nominal
film strength of well over 3,000 psi, while petroleum oils average
somewhat less than 500 psi. The result is more lubricant protection
between moving parts with synthetics."
Steve
CEO of Hi-Tech Oil Co.
Distributing industry leading AMSOIL synthetic lubricants for 19 years
This explains why a synthetic oil of a lighter viscosity can provide superior protection to a petroleum oil.