EB-RST3.0

I can throw my hat in the ring on this issue. Mine dumped oil at 8300 miles 4 1/2 weeks ago. Truck was picked up via flatbed tow and has now been in shop for over a month. First diagnosis was to follow a TSB that said to replace timing cover gasket. It took 3 weeks for the parts to arrive and the same for a service loaner to be provided. Dealer installed parts and tested (I do thank them for their thoroughness) and found it is still leaking. They do not know what to do next and they're awaiting instruction from GM. Meanwhile, I've now made two more payments on a truck that I do NOT have. Pretty bummed-out.