Check the drivers manual, it will give you that info.
no you should use gear oil
Sure, you CAN use any oil you want, but the question should be SHOULD you? The answer to that is use EXACTLY what your owners manual lists.
There are 2 answers that should be done together. Change your oil more often, and use a thicker oil.
it is origanal oil
It should written in your car manual which comes with each car or on the top of oil cap.
should say in the owners manual or on the cap
It will make your car use more gas than it should
what is a good engine oil to use in my car
Some cars as well as aircrafts use synthetic oil. Whether you should use it in your car or not will depend on the age of the car as well as its milage. If its too old, its probably not a good idea.
2 cycle oil if you are referring to a 2 cycle engine with oil injection.
Use exactly what the manufacture of your car recommends and nothing else.
A Honda CRF-50 uses a 10w30 four stroke motorcycle oil. You should not use a truck or car oil in the CRF-50.