I use synthetic oils on all my engines
I use synthetic oils on all my engines: Car, RV, Generator, Mower, etc.
it's more expensive, but I'm not worried if I used it past it's normal oil change, or if the temperature will be hot or cold.
Less breakdown from heat means less residual stuck inside the engine.
I used to rebuilt car engines back in my youth and saw the difference first hand.
Mobil 1 is my first choice, but I will use other brands if Mobil 1 is not available for whatever reason.
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