Hi,
At 5 yrs. and 30k mi., you're due for Plugs, Coolant, Polyrib Belt, Brake Fluid Change, possible Oil Change (I doubt the car is on it's original Oil), Cabin Filter. You're probably also coming up shortly on Tires and Brake Pads. This because each of these has a Time as well as Mileage interval. Not stated in the Manual, but that's how long these parts last or is a prudent change schedule. Besides, you establish a good baseline for your new car.
If the PPI checks out, you'd most likely be good to go the 300 mi. as is. If you are at 10k on the Oil, you can drop the Filter Cartridge and replace the 0.5-1.0 Qts. you'll lose. Topping up the Oil does refresh the Oil tremendously, though you will need to flush out the dirt with a proper Oil/Filter change shortly after getting it home.
All these things are easy DIY tasks and the archives here are full of the various procedures. Good Luck!...
Happy Motoring!... Jim'99
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