I have a 2009 Chevrolet Duramax with approximately 61000 miles on it and to my knowledge the only after market part on it is the Fass fuel system. The problem i am having since i bought the truck is that at a approximately every 1500 miles or so my change engine oil soon light is coming on. I have no check engine lights and everything else about my truck seems to be doing just fine. Any help would be appreciated! Thanks in advance and just an fyi I am new to diesels as this is my first one. Thanks again, God bless!