I personally would not put kerosene in anything newer than a Letter series tractor. compression and overall ignition settings of the newer gasoline engines will NOT like it. Kerosene also burns hotter than gasoline, and if the compression ratio is not right, detonation will burn your pistons and valves up in a heartbeat.
With that said, yes, kerosene in a lower compression engine will not hurt anything......remember, there tractors were designed to run "duel fuel", but they had specific configurations such as lower compression ratios, radiator shutters, exhaust manifold redirection butterfly valves, etc. etc etc. An engine designed to run on Kerosene will do just fine, IF up to temp....if not, you will just dilute your oil. Refer to the "dipstick" thread......that is why there were 3 draincocks on the oil pans. Now, if you want to add a quart of oil to a tank of gas, that is a whole other consideration. Many manuals indicate to add some oil to fuel in specific situations, and while you run the risk of fouling plugs if you go overboard, the residual lubrication effects can be beneficial (if you can put up with the additional smoke in the exhaust).
if your tractor is tuned correctly for gasoline, run gasoline in it. While you are not going to hurt anything in the letter or F series doing this, you are also not going to accomplish anything significantly "positive" by doing it (meaning adding kerosene). today's gas runs "cleaner" from a combustion perspective because there is no lead to leave deposits in the combustion and intake/exhaust components. This thread may become hotly contested as it grows, so I have stated my perspective and will leave it at that........
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