I'm putting in 3 quarts of Mobil 1 syn and a new Toyota filter every 5K. The dipstick shows oil dead center between the low dot and the full dot. I'm rotating tires at that time too. Takes about an hour. Call me crazy, but it brings me closer to my Prius, meaning I feel more attached to it and such. Yeah, that is crazy, it's just a car...but , really, it's an awesome piece of transportation technology that just so happens to be pretty "normal" in many maintenance aspects. Enjoy!

'04 Seaside Pearl #7. Fumoto oil drain, mudflaps, rear bumper scuff protector & rear warn system, compass mirror, EV mode button, 8" subwoofer in right rear cubby & 6" subs under seats, power lumbar in the front seats, Coastaletech hitch w/ Aspen bike/snowboard rack. iPod2car, 2 amps, Alpine component speakers, and DVD video, solid 47 MPG @ 70000 miles.