Does a 2008 kia optima 2.4 engine have a timing chain or a timing belt?

The 2008 Kia Optima with a 2.4-liter engine is equipped with a timing chain, not a timing belt. Timing chains generally require less maintenance than timing belts and are designed to last the lifetime of the engine. However, it's still important to regularly check the chain and associated components for wear over time.