RW,
Yes, diesel (as well as mixed with motor oil) is an old school remedy. But lve used that application only when the wood physically came in contact with the ground (or formation). I have some old wooden decks, used as bridges for crossing a creek. I applied the oil / diesel solution liberally before laying the bridges in place. Not a cure-all, but to slow down rot. Im not sure if I would apply to the walls of a building.
Charlie
