amsyari: eh sorry ah... don't mean to sound sarcastic...
hahaha.. just for the fun of it... 
i would rather think that what i'm looking for in a motor oil would
be viscosity, cling properties, other protection variables like
zinc or phosphorus content, and other goodies like friction
modifiers, low smoke low carbon capabilities etc etc yada yada...
of course the application of each characteristic of the oils is
dependent on what engine we're talking about, or the nature of use
(like most 2 stroker riders use 4T instead of gear oil for their
transmissions, SO, 4T that contain friction modifiers are not
recommended for transmissions that use a common oil for the clutch
and gears, which MAY result in clutch slippage)...
er... hope you don't take offence... 