Hey has anyone ever heard of this? I've had my truck for 6 years now. I've changed my oil every 20000 miles always use Rotella 15w40. The last few oil changes I've done the oil gets cleaner and cleaner. Now 7000 miles on the oil and still looks new. No soot whatsoever in my oil. I've never seen or heard of this before. I'm concerned. Where is the dam soot going and why? Anyone?