The 2017 kia optima oil type and capacity is5w-30 or 5w-40 and 4.8 quarts for the 1.6 l 4cylinder engine. your oil needs to be changed eventually. every 5,000 to 10,000 miles is a good rule of thumb. if you don't change it, there will be problems with the engine. having high quality oil is key for the engine to run smoothly. you will run into issues with the oil at some point. a common problem is an awful burning smell. this needs to be inspected as soon as possible or the car might explode. bad oil can cause the engine to stop working. you could experience terrible gas mileage. knocking noise may come about from the engine.
The 2017 kia optima uses a full synthetic oil for all engines. the 1.6l 4 cylinder engine and 2.0l 4 cylinder engines run sae 5w-30 or 5w-40. the 2.4l 4 cylinder engine recommends sae 5w-20. the oil capacity by engine is 4.8 quarts for the 1.6l and 5.1 quarts for the 2.0l and 2.4l engines, all with new filters.