Use grease, not oil to lube the op rod. A good wheel bearing grease from the auto parts store will work well.
Check the op rod on your M1. At the dog-leg there should be a little semi-circular cutout. It was put there to relieve stress at that juncture. If there's a right angle there with no relief cut, it's not only a collector's item, it's dangerous to shoot. The older square-cut op rods will eventually fracture at the cut, damaging both rifle and shooter.
When you retract the bolt, pull back straight. If you pull the op rod handle back at an angle, the op rod can pull out of the diassembly notch in its track. It's then necessary to field strip the rifle to correct the jammed bolt.
That's all that occurs to me just now.