Hey Marin. This might be a stupid question, but when you initially changed your oil, and obviously you check your dipstick to see if the levels are good before you close everything up right? Now did you start the engine to circulate the oil through the filter and then check levels again? I was just thinking that if yoiu didn't do so then you might have seen it full before that and not seen the .25-.5 of a quart lossed into the filter upon start up, as F5 stated, if you didnt check it again after initial start up. Maye it ran 6,000 miles or whatever a .25 quart low and you didnt realize it till you changed it.
