What type oil to use?

In any engine, the best lubricant is always the wisest choice. Synthetics are more stable at the molecular level than any natural oil product. They offer better lubricity, are resistant to mechanical "shear", high temperature chemical changes and flow better and offer more protection at higher and lower temperatures than any other lubricant.
Of course, if you want to use a conventional oil, it is your option...but shorten up your oil change intervals so that you keep the engine internals protected the best you can.

Most likely not. vehicles that year did not come with synthetic oil from the factory my bet that the vehicles recommend oil is SAE30 weight or a 5w-30