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I've been reading around, but nothing exactly matches my case. I was in class today and when I got a break for lunch I was walking to the truck and noticed I was leaking something under the truck. It was a heavy, steady drip from near the oil drain pan (on the passenger side). I can't locate where it is coming from above that. The coolant was just about completely empty. I added some water and got it home and noticed it had leaked where I had it parked before too. I couldn't see anything from the top and could only see a little underneath. I do have the CTS on it and all has seemed fairly normal (did get high deltas when pulling about 2 weeks ago (roughly 30)). It does blow white smoke when I start it for a little bit. What all could this be? EGR failure, oil cooler failure, head gasket, all three?