You should always use the spark plugs recommended in the owner's manual of your Cadenza. If you need to replace them right away, you should buy the same type of spark plugs that your car had installed.
You should change the spark plugs after you have driven between 35,000 to 60,000 miles (60,000 to 100,000 km), depending on the type of spark plug, your driving style, and the quality of the fuel used. Ideally, you should check your spark plugs after driving 30,000 miles ( 50,000 km) to see their condition.
⚠️ We advise you against using spark plugs different from the ones recommended by the manufacturer because every spark plug model has particular characteristics, and the engine of your Cadenza has been optimized to function with those.
The owner’s manual will surely include specific spark plug brands, but you should know that there are cross-reference charts that include different brands and state the compatibility between the different types of spark plugs. This will be useful for you if you cannot find the spark plugs recommended in your owner’s manual where you live.