What do you guys do with the extra oil when you buy 5 qts? My car says it takes 3.9 I am coming up on 1500 miles and at 90% on the MM. A guy at work with a 2007 is at 4000 miles and is at 50%. That could be a lot of months before an oil change. The way it was always recommended to me if I was going to do my own oil changes I should keep all receipts and make sure everything is well documented. Also the receipt for the oil and filter should be as close to the date of change as possible. I have seen some that buy oil on sale and stock up. I can understand the company saying just because you bought oil or a filter several months ago doesn!t prove you changed it now. Obviously the leftover oil would not go bad after several months but I was just wondering what your thoughts were on long periods between purchase as far as receipt dating vs oil and filter change dates as it relates to warranty by the company.