No, not unless you want to destroy your engine.
what is a good engine oil to use in my car
Use what the manufacture suggests. Consult the owners manual for the correct oil for the engine.
The engine dipstick is the only tool you can use to measure how much oil is in the engine.
so the car engine will perform using oil.
No, you cannot use ordinary car engine oil. Use a JASO MA or MA2 approved oil, or SAE SF or SG graded oil.
No
The engine oil to use depends on the type of engine (diesel or petrol). See the car manual to know the exact oil reccomended by FIAT for your car
Yes you use engine oil in all cars regardless of transmission.
Yes
Depends on what engine is in this car. Use the 5W-40W grade fully synthetic engine oil. For gasoline engine check that the oil is A3 spec. For diesel engine, it should be B3 spec.
on car with 200,000 or and does not oil added after 3000 use 10-30 if car over 200,000 and use oil use striaght oil 30-40 weight
A diesel engine would use 15w40 a gas engine could use 15w40 or 10w40