Don't let that worry you. Every car burns a little oil. A quart per oil change is actually reasonable. Just check your oil once a week, at the same time as you check the coolant level (cold) tranny fluid (hot) wiper fluid, steering fluid and tire pressure. Anywhere between full and add is fine. Don't go over full or you'll cause foaming which will really ruin your day. Under and you're not in any danger yet, but you're reducing the volume of oil and it'll retain more heat (not good). Your car will actually run fine with 2 quarts missing .... so long as you've enough to keep the level in the oilpan above the intake for the pump. But don't do that. And don't mess with synthetics either. If the engine has run for this long on regular oil, introducing synthetics will have you pissing oil everywhere. It'll clean out all the little build-ups around the seals, and since the synth molecules are smaller, they'll leak.
Personally, I'd change the tranny fluid and filter (garage job, trust me). You're supposed to do it every 60,000, but noone ever does. And check the coolant mix. Too many people just top off with water and weaken the mix. Eyeball the belts for glazing, or nicks. And squeeze (cold) the hoses. They should all be strong enough to prevent you crushing them. If you can deform them at all (and I'm including the heater hoses here) replace the lot. Any green corrosion around any of the hose clips means they're done too. Changing only the one hose is just retarted. They've all been on there the same amount of time, with the same fluid in them. Hoses, coolant and thermostat all get tossed at the same time. Costs a lot less than a tow off an interstate in rush hour traffic.