Brian. I would be more concerned about 1 year old alcohol than i would top lube. The extra top lube wont hurt it, as far as the guming affect it will happen with one bottle too if you let the fuel set in the bowls a long time without firing the engine and letting it run awhile. The concern with the alcohol is if it sits around a long time it will condensate moisture into the fuel. I bought a drum of fuel from my guy one time that he had stored in a warehouse on a concrete floor over the winter. I changed every ignition part on the car tying to get rid of that high RPM pop and it turned out to be bad fuel. Dont buy a barrel this late in the year just buy fuel at the track and add oil per specs. ( about 1oz. per 5 gallons ) Don