Hey guys, I have a 03 GMC 3500 with the Duramax Diesel and lately, if you let it sit at idle,, it will start burning oil like there's no tommorrow!! It also likes to do it when you punch the accelerator down. Anyone have any suggestions on what mmay cause this? It has 86,000 miles on it but thats like baby steps for a diesel! Oh, and once it starts doing it while you sit there, it won't stop. Thank you for your time!