The Manual might call for conventional oil but I still prefer a 100% ester-base stock synthetic oil like Amsoil or Redline, etc. Last I heard Mobile 1 is not full synthetic but uses enough percentage of synthetic that the government say they can call it synthetic. (Freaking Politicians

) I like to see the base number close to the top weight number, like 10w-30 rather than 10w-40 or 50 as it has less viscosity improver additive and more real oil. And if you run a synthetic you don't have to worry about viscosity thinning at higher temps.
Oil type is one of those hot-button subjects, like gun control, everybody has an opinion but talk to some of the real oil scientist as to what goes into an oil for specific uses and it will make your head spin.