The above situations are normal conditions when the active eco system is activated to improve fuel efficiency.
Active ECO operation
Limitation of Active ECO operationKia Cee'd JD Service Manual: Front Oil Seal Repair procedures
Removal and Installation
1.
Crankshaft damper pulley.
(Refer to Timing System - "Damper Pulley")
2.
Remove the front oil seal.
...
Kia Cee'd JD Service Manual: Tire Repair procedures
•
Using tires and wheel other than the recommended sizes could
cause unusual handling characteristics and poor vehicle control,
resulting in a serious accident.
...