Originally Posted by Gary - K7GLD
Biggest problem with multi-grade oils, is that the actual volume of the lubricant is diminished by the volume of the stabilizers required to extend the the temperature vs viscosity range involved - and that percentage CAN be pretty high. In that case, 30% of what you are buying in a bottle of oil may well be a non-lubricating stabilizer element that you don't really need, and is NOT providing any actual lubricant properties.
That stabilizer MIGHT be needed in areas of the country, or equipment types operating in wild swings of temperature - otherwise, if NOT needed in those conditions, you get lots more actual lubricating for your $$$ in a non-stabilized, single weight oil - whether it's a vehicle engine, or a generator.
I fully agree with Gary.
Forget what oil your water-cooled engine uses, this generator is air-cooled and requires an oil that will protect it accordingly, as the manufacturer recommends. A single weight oil is recommended for a valid reason. However, bottom line is, it's your money and your genset to do with as you please. Which follows an old Indian saying: "one man should not tell another what to do".(maybe not exact quote)
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