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MustangMike

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Mike, reducing the oil would make the mix more volatile, which is a lower octane. Which unless it started detonating could be a good thing.
Probably what you meant.

Dan, I used to believe that, but I think you are wrong. I was on your side of the argument previously, then I researched it and learned that I was wrong.

Oil (and diesel) is lower octane than gasoline. The reason a diesel has such high compression is due to direct fuel injection timing the ignition.

The more oil is added to the fuel, the lower the octane.
 

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Diesel doesn't necessarily have high compression, but high compression is needed to combust diesel. High heat needed, or else it doesn't ignite or combust.
 

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Most diesel engines have compression of about 20:1, as opposed to about 10:1 for gasoline engines. That compression would result in pre ignition in a gasoline engine.

The reason a diesel engine does not suffer from pre ignition is not because diesel is higher octane, it is because the direct fuel injection times the combustion.

A diesel engine does not have a spark plug, but it may have a glow plug to get it running and warmed up.
 
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