Thanks all. My old memory and seldom oil changes failed me. The filler cap says 5w30. I use full synthetic and has been dealer oil and filter then DIY with Mobil 1. Thinking Kirkland or Wal-Mart may be good low cost alternstive to Mobil 1, yes 5W30.
Truck is very low mileage. So last oil change was further back in time than recommended.
Getting hard to find someone to recycle used oil.