I would do 5K oil changes and if u want to stretch things use a Fram Ultra for two oil changes.
If you dont mind answering a few questions..looking for a small hatch for my wife as I think we are selling our Honda Fit.
1) gas mileage?
2) road noise?
3) comfort on trips?
1) between 28-33mpg. So many variables lol
2) The Cooper CS5 Ultra tires made the road noise less audible, but it's not as quiet as my Jeep.
3) It's not cozy like my dad's old car, 2000 Chrysler LHS, but it's fine. Nothing to brag, or complain, about.
It's been VERY reliable and has more room than it seems. The plastic behind the rear seats and in the hatch make things easy to clean. They interior layout is meh, but user friendly.
I got the Matrix because of it's versatility and reliability. Comfort and road noise didn't pertain to me. It's been a nice combination of everything though. Not a Cadillac, but gets better MPG's. Not a VW TDI, but is a bit more reliable, IMO.