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If you want a good clean burning fuel that will help your engine last a long time,

LNG, Propane, and CNG.  My dad had an International Harvester that ran on propane and we never even had to take the valve covers off. Changing the engine oil every 5000 miles(75 Hours) seemed like a waste because the oil looked as good as the day we put it in. We changed the spark plugs once in five years, and I doubt it needed it then. Looked just like this one.