Oil for a Slant Six that's been sitting a long time

Buy a 12 pack of generic 10w30 at Wal Mart and 2 cheap filters. Change, run for a week or two and change again. Don't go too nuts trying to remove all the sludge at once, you risk clogging the oil pickup.

When you adjust the valves, start the engine with the valve cover off and make sure all 12 rockers are oiling out the top.