The factory manual calls for oil changes ever 8000 miles, or 13000 km, or 6 months. It also states the tires should be rotated at the same time.
I change my oil every 5000-6000 miles, just to be on the safe side, and I use synthetic. I am not saying you should use synthetic yourself, its just my personal choice. From everything I have read, I believe it works better and is worth the extra cost.
If you are at 10000 miles since your last oil change, I'd change it ASAP.
Spark plugs are every 32000 miles, 52000 km, or two years. As far as the ball joints and belts, replace them when they start to fail, not before, is my policy.
2012 Jeep Compass Sport 4x4
2.4L I4, CVT II, Freedom Drive I
2010 Dodge Dakota Quad Cab 4x4
4.7L V8, 545RFE, Big Horn Edition