1995 F-150, 155k for miles;
5.0, Auto, 2 wheel drive.

In the Winter (in Southern California) I use 6 qts of Castrol 20-50, and for the Summer, trips to the Desert, etc, I use Valvoline Racing 50 wt, 5 qts with a measured top-off of Lucas Treatment.

Change the filter ONLY, fill the new one with LUCAS, and continue. I only change oil 3 times a year. No rattle, no lifter tick cold, and I'm hoping for another good year. This is my Company Truck, and Home driver too.

Bearings get worn; Motors get hot. I have 33" BFG's, and didn't re-gear. (my fault) But she still starts and runs quiet, thru the muffler!