What are you doing to stop carbon build up on the valves of your direct injection Hyundai engines. On the one engine we have had for 18 months now (Accent) I use Techron in the gasoline. We try to buy fuel at Chevron/Texaco but carry a bottle of Techron to put a bit in the gas if we buy cheaper fuel. Several mechanics have highly recommended it. We will do the same in our new Santa Fe.
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