After nearly 8 years and 180,000kms the only issues I've ever had with my "GM" product has been 1 alternator, leaky waterpump, and a failure of the DVD nav unit.
Well today was not a good day...........There was a bit of antifreeze on the driveway today after my wife pulled out, when she got back I checked the level and sure enough it was down .5L or so. Looking underneth it was running down the right side of the transmission, just a small amount, a drip not streaming. Off to the local ma and pa shop where he quickly diagnosed it as the right head gasket leaking
Drove the truck back home, it was still running flawless. Got to checking things out myself as I just could not belive it had a blown head gasket. Well, I fixed the problem with a $42 part from GM. The rear tee that splits the front heater hoses to the rear heat was dripping, thank heavens for simple and cheap fixes!