With having to fill it every 3 days, you have a serious leak. Granted that I went through a full bottle in a day, but that was because of a cracked radiator, so when it had some pressure behind it, the fluid just flew out of the system. You though, have a serious leak somewhere. Definitely take it to an indy shop or you dealer if you think that they'll give you a discount because of how recently your CPO expired.