This kia optima 2.4 engine is regarded for its dependability, however some owners have reported problems such as excessive oil consumption and engine knocking at higher mileages. Regular maintenance, especially timely oil changes, can help to decrease these dangers. Kia has addressed some of these problems by providing longer warranties and recalls on specific models. When properly maintained, this engine is known for its longevity, making it a popular choice in the Kia Optima series. Routine maintenance for the kia optima 2.4 engine includes oil and filter changes, spark plug replacements, and air filter checks. The 2.4L engine uses high-quality synthetic oil, which can help to lengthen the time between oil changes and prevent against wear. Checking the timing belt or chain, depending on the model year, helps to avoid costly repairs and ensures the engine's reliability over time.