Okay here is what happened. I drove home from work last night which is 45 miles from my house and stopped at a convenience store and shut off my car. I was there about 15 to 20 minutes. when I came back out to start my car, it started but it was like the glow plugs were not working. The engine was really hard to start and super rough. So I thought I didn't give the glow plus the proper amount of time. So I tried again making sure the glow light went off. Same thing. About 2 weeks ago I had the engine code for glow plug system come on in which I did find that 2 of my glow plugs were bad so I replaced them all,plus the harness and relay. I was wondering could this be something linked to a turbo problem? I have notice that my mileage has not been as good lately. Around 36mpg instead of 40mpg. If so what should I check for and how bad could it have hurt the engine if it was oil in the cylinders. Hopefully not the last problem but any ideas or suggestions would be appreciated.