Is Optima known for engine sludge? The dealer seems concerned that There is a risk of engine sludge in this car if I do not get oil changes every 3,000 miles.
Of course, the manual says 7,500 miles and he insinuates my Kia factory warranty will not cover engine sludge.
Of course, the manual says 7,500 miles and he insinuates my Kia factory warranty will not cover engine sludge.