When I tried the two codes to compare against each other as I am trying to book now, the OL5040 came up significantly less, as in $179 versus $158 for an intermediate base rate. The overall rate with taxes and charges still is not less than I have reserved through National, but I am trying everything right now because last year I reserved for $103 base rate for a week with an intermediate and I am having total issues with the rental rates this year.
Never mind, the darn thing toggled the type of car on me while I was testing the two codes. They do come out exactly the same.
I am getting better rates than this rate at National using the steps outlined at Mousesavers and my BJ's coupons just so everybody knows.