Use exactly what the manufacture of the engine recommends. Most small air cooled engines of this size use SAE 10w30 full synthetic.
Common sense. Use the incorrect oil and you will damage the engine.
You can use any SAE certified engine oil in your Nissan. The engine oil should be a 10W-30 weight engine oil.
5w30
It is possible to use 4-stroke oil in a 2-stroke engine in an emergency situation. You should not use this oil in the long term as it will damage the engine.
You should use 327ci 300hp 1966 Corvette engine oil ;)
That is what you should use. I recommend you use synthetic oil in this air cooled engine.
5w20
4 stoke engine oil
an oil that has a high zinc content
For stroke engine bikes use the engine oil as gear oil. In case of a two stroke engine you can use regular 80 W / 90 gear oil.
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.
The 97 Escort should have 5-30 oil.