So good looking out creating a new baseline for your new to you truck.
I’d go OE with internal filter and the gasket is reusable, however since you didn’t install it who knows what shape it’s in-they are cheap to replace.
I chose to use Mobil Delvac Full Syn for fluid. It’s TES-295 approved and can be had for a deal off summit racing. I change the external filter (Allison filter on Amz) every (engine) oil change or every other be spending on what I’m doing with it. I change my oil every 10k miles. Suggested by Blackstone.
Anyway you would take the pan off for the fluid change-to get 95% out. Why not wipe it and see what the magnet shows...
Then carefully seat the gasket and torque X style across the bolts.
This is a good time to change transfer case, front diff and rear diff too.
🤘 Kennedy fuel system support hardware, CCM front Diff Drop, some LEDs to make night into day, got some big ol 20's and wide ass tires and a nice display to show me what's up under the hood- 2012GMC2500CCSB
Last edited by Sierraluva; 12-03-2019 at 08:07 PM.