Yes but once you do there is no turning back and no mixing regular motor oil ever again with the synthetic oil....only straight synthetic....or use semi synthetic....now that can be mixed with regular motor oil in a pinch.
It is not required. You can use conventional or synthetic oil.
Yes
15w40 conventional 5w40 synthetic 0w40 synthetic
NoNo
You can use either conventional or synthetic, your choice.
You can use synthetic, conventional, or synthetic blend. All are acceptable in a Dodge Caliber.
15w40 conventional 5w40 synthetic 0w40 synthetic
look in your owners manual and see what weight oil they recommend and then get that weight oil in the synthetic oil that you like.
5w20, does not have to be synthetic.5w20, does not have to be synthetic.
4.54.5
Next to the oil filter.
5w30 or 5w40 synthetic diesel engine oil