Oem for oil and engine air. I use aftermarket for the cabin air filter to get a more allergen friendly filter.

 

I run Wix XP filters for motor oil, cabin filter and engine air filter. Penzoil Ultra Platinum 5w30 for oil. (Oil/Filter get changed at 5k) Trans will get the Mobil approved fluid and drop and fill at 40k and every 40k after that. Front and rear diffs get Mobil Delvac without the slip additive. Plenty of information out there on different filters and fluids. Check out Bob is the Oil Guy on Youtube. Lots of stuff on that page.

 

Any new brand filter is going to be better than an old used filter. I still don't buy into some of the oil filter claims saying 20,000 miles. But I've used various brands. I know Fram got a bad rap many years ago but that was long ago.

 

Thanks all that replied. OEM (AC Delco) for the filters sounds good then. Re the trans fluid, this is the Mobil 1 "BLUE" label stuff, right? I think I better get some Kroil on the exhaust flange studs/nuts, and make sure they are gonna move some before I get too involved with dropping the trans pan and doing a filter/fluid change. OEM for the trans filter as well, right? Is Rock Auto gtg for this kinda stuff?

As an aside, the truck is running real nice, averaging about 24mpg in combined city/freeway driving so far (driven about 1K miles). But I do have a light foot... Very lucky to find that Ext Cab model. There are even LESS of that model for sale now around these here parts, and most have considerable mileage on them. GLAD I didn't hesitate to go look when this (now MY) 2022 with only 19K miles on it hit the market (GM Dealer trade-in). Other than learning how to work all the electronic stuff, I'm pretty darn happy with it.

 

Filters you can use OEM or Equivalent. Whatever you prefer.
5W-30 Full Synthetic is what the Engine Requires.. And yes whatever brand you prefer

Transmission should be Flushed every 50K or Drain and Filled every 25K
But, yours it been used so little. If it was not done it might be something to think about doing.

All Transmission Fluid is Hygroscopic (absorbs water)
The 8 Speed Transmission runs cooler
Which is good for the Transmission but not good since the Transmission does not heat up enough to "burn off" the condensation
And the moisture is the issue with causes the Transmission Shudder
The Fluid to use is:
Mobil 1™ Synthetic LV ATF HP

 

From Engine Masters, S06 E05, the oil filter test results:

The above test results were from a V8 engine....but filter metrics are still valid. As @gherbert stated, OEM or equivalent is sufficient unless you have some special application....