Recommeded oil for 3.2
 

What is the best brand of oil to use in the 3.2 engine. I know it should be 5-30W

Brand really isn't important. Any name brand is just fine

type of oil
 

Premium, Synthetic Blend, or Full synthetic?

2013 and later require synthetic. Pre-2013 can use whichever you want. The important part is changing it on time (or earlier).

You can use mobil 1 or castrol. Whether premium or synthetic, the oil change interval is the most important thing to consider.