I just bought an old 1940 Chevy 1/2 ton truck in pretty good shape. Problem. The steering wheel is jammed and will not move. Noticed the steering box has a drain plug and I expect it 1) has no oil; 2) water got it and possibly rusted it a bit; and/or 3) something else is tied up in the mechanism inisde. Any thoughts? And, what kind of oil should I use if it is dry? Thanks all!