Is it time to change oil viscosity?

[Mr.Spool]

The real hang up is that people believe thicker oils create higher film strength and that is absolutely not true and the majority of motorheads believe that to be true because it's repeated over and over again. Film strength is created in the additive package, not the base oil as Brad Penn would have you believe and their oils have some of the lowest film strength. If thicker oils created More film strength then the oils in 540 rats blog with the highest viscosity would have the highest film strengths, but they don't. The thinner oils on his list, typically 5W-30 have the highest film strength. Can we say that the thinner the oil is the higher the film strength? Absolutely not. It's the additive package. The most powerful Corvette engine currently produced comes from the factory with thin oil.

Are you basing what your saying soley on 540 rats article?

 

[turbocamino1]

Re Rat540's credentials...from his blog >"Lifelong Gear Head, Mechanic, Hotrodder, Drag Racer, and Engine Builder...a working Professional Degreed Mechanical Engineer, and Mechanical Design Engineering is what I do for a living. A Mechanical Engineer is clearly the most qualified Engineer to test motor oil that was formulated by Chemical Engineers,..holder of THREE U.S. Patents, for breakthrough designs of Mechanical devices for Military and Commercial Aircraft" I've personally takes the 10 hours to read all of his blog.. Surely seems an honest accesment to me. After 30 years in a race fab shop i can smell a "Rat"..not in this case though.