preserving new vehicle?

I just bought a rust free 2003 dodge ram that sat inside for the last 12 years. I put the truck on the lift and used a wand to spray 2 gallons of diesel drain oil in everything. I sprayed it up in the sides of the bed ,rockers ,doors, and frame and everywhere I could.. I left it sit on the stones for over 1 month until getting the title cleared. Pulled it in the shop and its still dripping oil.