The 1.4 Liter Motor which some think needs premium does not, and will run just fine on 87 Octane, as I have run mine for the past 4 going on 5 years. The motor requires 5W40 weight full synthetic, NOT 5W30. I keep a quart in the truck to keep it topped off. Usually will be down around 1/2 quart every 1500-1700 miles.
Oil change intervals will vary, but it will signal you when it is time, somewhere between 6000-8000 miles is when the oil light comes on in mine.
I have the Limited Edition version of the 2013 Dart, while I admit I don't drive far with it approaching 30,000 miles, it has had its moments.
No rattles that I can tell, the transmission was a sore point, but with a recent update to the transmission computer the car has been well behaved and responds very well overall.
I did have a Blue Tooth Module fail in the car, but it was under full warranty and was replaced at no cost.
The original Kuhmo tires were problematic. If buying a used one and it still has it's original Kuhmo's do chuck them.
I am running Toyo Celsius Tires which are rock solid and are a Hybrid All Year "All-Condition" meaning they can be run in winter and give excellent traction. These tires give me the same gas mileage as the Kuhmo's. (They are Deep Mountain Snow Rated, so no tire chains.) Note: I live in Georgia and they do very well on ice.
During the winter, if you get ice/snow and the temperatures fall below freezing, the fuel filler door can freeze shut and the automatic release will not open the door if pressed. Open the trunk, and reach for the manual release in the right side of the trunk; while pulling on the door and it will open.
When considering the car:
Ensure ALL recalls are carried out. The lack of response and performance was tied to the transmission control module and transmission programming.
The 1.4 Liter runs fine on 87 unleaded. High Octane is NOT needed unless you drive up and down Pike's Peak everyday.
Get rid of original Kuhmo's if the car still has them. The tires have a history of losing air over a period of less than 2-3 weeks. Car will perform better with nicer tires.
Look for the Limited's which carried the 1.4's. Better interior, and electronic guages. I have had no engine related issues with the car.