Picked it up, & they claim "excessive valve guide wear" allowed oil to leak down & burn off in the cylinders. New heads, valves, etc.
Of course, the oil was overfilled when I went to pick it up, so they had to remedy that. Then, as they were pulling it out of the shop, one of the service guys runs into the office to say, "that Yukon's got an exhaust leak on the left side...".
This is not giving me a whole lot of confidence.
FC
