My name is Brady and I recently bought a 2005 Chevy Duramax. I have poor mechanic skills, especially with diesels, which is why I have registered to this forum. First thing, the oil has just been changed in my truck, but when I turn the truck on it shoes "change engine oil". Second thing, sometimes when I accelerate, especially uphill, there is a faint rattling or knocking noise, sounds to be coming more so from the passenger side. It does not make the sound all the time, just randomly. The gentleman at the car dealer told me that fuel injectors were checked recently and in good condition. Once again, that is coming from a car salesman. I have heard some Duramax owners say it is just the sound the Duramax makes. I am not sure what I need to do. Advice anyone?