Just make decision...there is no recourse if you get the "wrong" information off the internet. You will have people tell you they've ran synthetic with no problems and mineral oil with no problems. If you change it every 3k odds are it doesn't really matter.
http://www.dezmo.com/oil03.html
http://www.dezmo.com/gordononoil.html
http://www.dezmo.com/dezonoil.html
http://www.bobistheoilguy.com/