Mercy Zee... it's true that thicker oil means more film thickness but thicker also means MORE friction not less...
Quote VP Fuels
Is a thick motor oil better if you live in a warm climate? You might
think a thicker oil (high viscosity) would offer better protection.
Well, yes, and no. Viscosity is critical to keep metal parts separated
within the engine and the proper viscosity grade does that. That being
said, you don’t want an oil that’s too thick because it creates too
much frictional drag within the oil itself. This creates additional
heat, which causes the oil to thicken (oxidation) and can also rob
engine performance by reducing horsepower.
Quote Gmtech94 GSXR
When I raced we were sponsored by an oil company and helped with the
research of their product .The thought at the time was to run 20w50
race oil to provide for the best lubrication under racing conditions
hence no oil related failures . After many races and a lot of real
data research the conclusion was in this case to run a 10w30 oil as it
provided better lubrication and less engine wear over a long period of
time ,remember motorcycle endurance racing in 24 and 30 hour races .
Although we never had an engine failure due to oil properties we did
have a lot of feedback on engine wear as well as transmission and
clutch wear . I have to say we did abuse these bikes on occasion with
spinning the back wheel to turn the bike as well as the occasional
fall .The ignition was a weak link but I could change out the pulsers
in about 17 seconds once the bike was in the pits . In conclusion
10w30 ran cooler and did not break down as much as the thicker oils
did.
