A product that I use & have good results with is @
www.lubecontrol.com Pretty good value at about $30/gallon shipped to your door. Another product that many swear by is @
www.auto-rx.com One of the best sites I've found for oil info/concerns/issues is
www.bobistheoilguy.com To clean your oil pump pickup screen, you will have to pull the oil pan. This should not be too bad of a job on a 2wd, 2.2L rodeo. I would definately inspect that screen!! Make sure you change the timing belt every 50Kmi on that 2.2 as well!
G/luck
Joel