Re: Oil ratio for a Scott Atwater 16

[rudderless]

Oiling requirements are different for 2strokes and 4strokes. Oil passes through once with a 2stroke. Oil recirculates many times on a 4stroke.

Think of oil as a plate of spaghetti. Nice long strands make good film strength. As the oil does its job the strands get sheared and cut up causing the film strength to go down. Synthetic oil resists this shearing better and holds its viscosity better with temp changes.

I use the synthetic oil at 10-30w in my autos from November until April. It starts easier at -10F and I wont be changing it during that period. Summer I use regular oil at 20-50w and change at 3000mi.

Sure, at 100,000 miles I assume with extended oil changes the synthetic would have an advantage. Change every 3000mi I am sure one would see equivalent wear.

Lube requirements for these older 2strokes are different than newer ones. One needs to use the mix no leaner than suggested in the original owners manual.

Thought this was covered already…