I have a 2005 which should be the same as an '03. My procedure is to warm the engine, about 5-10 minutes, pull the drain plug, pull the filter and let it drain for a good 10 minutes. I then put on the new filter, KN-138 with the nut on the end (Much easier to R&R with a socket wrench than the regular filters with a filter wrench), replace the drain plug and fill it to the "F" line on the sight glass (All of this done while on the center stand). At this point it has taken nearly 3.5 Qts. I then fire it back up, let it warm for a few minutes, shut it down and wait another few minutes to check the level. At this point it takes almost another 1/2 Qt, total nearly 4 full full Qts. (3.8-3.9).