I use Pennzoil Platinum (PurePlus) 5W-30 in a 5 quart jug from whoever has it around. The filter I get for $10 from
Amazon. I use the 5.6L version of the filter on my 3.7L. It is larger which means slightly more oil capacity overall and more available filter media.
Right now I use 5k mile OCIs and this will be my first try at a 10k mile FCI. Right now, my OCIs have been around the 6-month park when I reach the 5k. I wouldn't hesitate to take it to a full year though if I drove alot less.
Specifically, my last oil change was 11/7/16 @ 90k. Previous to that it was 4/20/16 @ 85k. Before that it was an unknown oil brand/filter/mileage/duration as I bought it from a used car dealer.