Internal-combustion
NO, do not use diesel oil and a gasoline engine.
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An engine needs lubrication to reduce friction and prevent overheating of the internal parts. Oil is added to the gasoline in a 2-cycle engine because this type of engine does not have an oil reservoir.
The type of oil used for a 1977 VW bus is going to depend on whether this engine takes gasoline or diesel. The gasoline engine can use a 10-30, 10-40, or 5-30 weight oil depending on temperature. The warmer the temperature the higher the weight. The diesel engine has the oil already in the fuel.
A 2-stroke engine requires adding 2-cycle oil with the gasoline.
Gasoline is processed from crude oil. It is not oil but it is from oil. Diesel is a type of oil and it is also made from crude.
According to the 2002 E-150 owners manual : ( 5W-20 ) With engine oil filter change ( 6 quarts / 5.7 liters of engine oil ) for all gasoline engine sizes
It gets its lubrication from the oil mixed with the gasoline.
No, putting gasoline in a diesel will destroy the diesel engine.
No
Run it out of oil.
4 Cycle engines do not require an oil and gasoline mixture. The 2 cycle engine does require an oil and gasoline mixture. This oil and gasoline mixture for the 2 cycle engine provides critical lubrication for the rotating/moving parts.