Advise to the new Sonata buyers. Go to the dealer for...

the oil change and regular maintenance. The new GDI (gasoline direct injection) engine has a new high-pressure fuel pump driven by the engine crankshaft. It provides the high pressure needed for the internal fuel injection inside the engine cylinder. Although it is covered by the 100,000 miles powertrain warranty, but if there is anything happened to that pump, Hyundai may declare that you did not use their services. Then you will be out of luck.

I actually recommend all car buyers today to use dealers' oil change for their new cars, especially when the car manufacture provides a long warranty coverage. Today's engine is more complex and powerful than ever before. And today's motor oil is not protective as before. Even the manufactures are not sure how long their engines can last. So protect yourself and don't let bad things happen to you.