Comments by "David Elliott" (@davidelliott5843) on "Will 4-stroke oil damage a 2-stroke engine? Let's find out!" video.

  1. The biggest west factor on two strokes is piston slap. Uneven combustion at part throttle causes the piston to literally rattle about. Run at enough load to avoid that and the engine will have a long working life. The latest direct injection 2 strokes breathe air only. Fuel is injected direct into the cylinders after the ports have closed. They have far less piston rattle. Also there is no gasoline to wash oil off metal surfaces so they need less of it. Around 50% less than a normal two stroke.
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  2. Castor oil will separate from gasoline and allegedly won’t mix with mineral based oils. I’m not convinced it won’t mix or even if that matters to an engine. The big issue with castor oil is when the gasoline has evaporated the oil polymerises and clogs the fuel system. It’s the same effect as linseed oil which is used in paints.
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