Switch to Full Synthetic Oil

I think no matter what you decide to use, you should change it before you store it .. I've always liked the idea of fresh oil in the engine when it's gonna sit for a while.. That way you don't have all those contaminants clinging to the walls of your cylinders, corroding them.. I also had a very reliable engine builder tell me to rev the car right before storing, and pour in some Marvel Mystery oil until it stalls, to coat the cylinders and prevent a ring from sticking.. Makes a mess in the spring, and spark plug changes are inevitable, but the theory sounds good..

I agree w/ Locomotion too about the older seals, etc.. Back in the day I had a '71 Chrysler 300 w/ a 440 in it .. I switched to Mobil 1 synthetic when it first came out and suddenly I was adding 2 quarts of oil every week.. I think with your "fresh" engine that won't be an issue ...