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The 2013 Kia Optima uses standard oe coolant, which should be replaced every 60,000 miles. The air filter should be changed every 15,000 to 30,000 miles, while spark plugs should last up to 100,000 miles, unless they are copper, in which case they need to be replaced every 30,000 miles. Various engine issues may arise such as loose gaskets, popped spark plugs, oil leaks, and excessive oil consumption. It's crucial to promptly address these problems to prevent engine overheating, which can result in fires and even the car exploding.
The 2013 Kia Optima requires the use of regular factory engine coolant/antifreeze.