Ok im starting to sound like a rep for the company but, I had the exact same problem, I searched FTE and heard about Rev x oil additive, I put it in on friday and sat morning my truck started quicker like when its warm and ran with full power before it was up to temp. It not only fixed the running like crap when cold it also gave me more HP and less turbo lag. I live in AZ so when I say cold I mean just started. I would definitely try it.