Answer / gautham

With rare exceptions, 4-stroke engines run at substantially
slower rpms than a comparable 2-stroke engine…most in the
under-10,000 rpm range vs. 12,000, 13,000 or more for a
typical 2-stroke of the same size. They are engineered to
deliver maximum power at slower rpms, with bigger props.
What does this have to do with it? One of the main factors
used in determining the proper oil content of fuel is heat.
To use the well-worn term, it doesn’t take a rocket
scientist to figure out that the more slowly an engine
turns, the less heat it generates from friction. If you
don’t believe that, rub your palms together slowly, then as
fast as you can.




So….lower rpms = less heat = less need for oil.

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