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I would recommend taking it to a car/tractor shop.
My 1979 International 1723 gas school bus weight is 21,700 lbs. The 1980 should be very similar. I wouldn't think Gas v/s Diesel would change the weight that much.
My 66 has a naturally aspirated 345 International v8
10 quarts for diesel engine or 7 quarts for gas engine with oil filter change.
Lose some weight then....................fatty
Definitely, the more weight the engine is pulling the more fuel it will use.
A diesel engine is heavier than a petrol engine because some parts in a diesel engine are made from cast iron such as cylinder sleeves etc. The weight difference is usually between 10-20kgs.
Gas 10w30 Diesel 15w40
5w30 or 10w30 for a gas engine, 15w40 for a diesel
International Gas Union was created in 1931.
A gas turbine engine will usually yield more power by weight than a piston engine. Main downside is that it can't be throttled very well. Energy efficiency isn't all that good to start with, and will drop right down if it has to be operated outside its optimum range.
A gas only engine has a spout where oil is added to the engine. If there is no spout, then it is a gas/oil engine. FYI - gas only engine is a four-stroke (four-cycle) engine and the gas/oil engine is two-stroke (two-cycle).