I had an '11 optima sx, right after the refresh. Beautiful car. Returned the lease on its 3rd engine.

1st one had a spark plug fail and basically melt. Piston seized. Had power, then it didn't, while doing 60 over a bridge.

2nd one went after an engine mount failed. Block ended up cracking.

Only consolation was that I was paying kia prices, not their over inflated sense of self pricing they try now.