I did our second Oil Change this weekend (12065 miles) and while checking everything else found that the coolant rezzy was almost empty (cold). There was about 1 inch of coolant in the bottle and it's very narrow at the bottom. I filled it with Dex-cool and will keep an eye on it (and maybe pull a plug or two) but don't see any signs of coolant leaks. Any Ideas? Is this normal for 1 year of driving? It wasn't in my 5.3l truck.