I don't think the diesel is new, but something else to consider. They put diesels in the Colorados overseas (such as in Malaysia), that motor, a 4wholebunchofletters2T Isuzu should actually be transplantable with GM parts. Problem is: overseas, they don't swap cars every 5 years, so getting those parts before they're used up is problematic. However, if you look on Ebay, there's a guy selling an Isuzu diesel from a Colorado pickup - he's in Texas, so getting it is possible. Of course, I don't have a spare 11k sitting around for such a project...