We purchased a Chevy Traverse LTZ with the direct injection engine. Anyone know if these engines are prone to any oil related problems? I have read the direct injection is particularly hard on oil.. don't know if its true. I changed the oil at 1000 miles because it looked black.. I know that the color doesn't mean much but I am a little old school. Anyway, just ticked 2000 miles and its black again. Doesn't smell bad, just black. Wondering if it has something to do with the direct injection... Any thoughts? I was planning on Castrol GTX for oil changes, but I am open to suggestions. Thanks.