 All my service was performed on time and engine began to burn oil.  The dealer found bad ring and recommend to Hyundai of America to fix.   The tech line from Hyundai  said it was normal for the engine to use 1 qt of oil every 1 k miles.  I have never heard of such.  If this happens the engine would lock up before the next oil change.   Do not by this car as the company will not honor the warranty.  The dealership also took my engine apart and found that it was extreamly clean and had been service on time as it should. They also sent pictures to the Tech line and they still would not stand by the warranty.