Easy...you take out the old diesel engine, drop a gasser in. Not rocket science
No, you cannot convert a gas engine to a diesel engine. A diesel requires much stronger parts.
You cannot convert a diesel to gas or a gas to diesel. They are made differently. You can change engines but not convert an engine.
You cannot convert a gasoline engine into a diesel engine. You will have to remove the gas engine and install a diesel.
You'd need to swap in a gas engine. A lot of people believe that the Oldsmobile 5.7 LF9 diesel was a gas engine converted into a diesel - this is simply not true.
Engine oil capacity?
Realistically it wouldn't be feasible to convert a diesel engine to gas. Diesel motors require much greater compression - enough that it could cause an explosion with a gas-configured motor. Plus, diesel doesn't use ignition or spark plugs, and the fuel pump/fuel ignition systems are completely incompatible.
No you would need to change out the whole engine. There are a lot of things a diesel engines has that gas engines don't. It is possible in theory, but in practice it would be so expensive a brand new gas engine would be cheaper.
No you can not use gas engine oil in diesel engine oil because processing of diesel engine is different from gas engine oil. If you use this then it damage your vehicles.
Rudolph Diesel invented the diesel engine which uses diesel gas.
That is a GAS engine.