About 3 weeks ago i bought a 05 Colorado with 174000 miles on it to get me back a forth to work and anything else i might need to do so I dont tie up the family car. A couple days after getting it I noticed white goo under the oil cap at first never seeing in before i freaked but after researching I found this could be condensation or a head Gasket. I have done a block test that came out as ok. Im not loosing any coolant (i check amost everyday), blowing any white smoke, and the truck runs fine. I got the oil changed the other day and drove it around a little just to notice that the goo is still there and now there was a little on the dip stick unlike before. Now I do addmit that i dont drive but a couple miles a day if that and the truck was sitting some time before I got it. My question is there anything else that could casue this that I might be missing?