@jfoj
Just stopped in my GMC dealer.
They have confirmed my vehicle will get the N*000 inspection and either a new engine or 0-40 oil recommendation. I asked if, given I have 1000+ mile towing trip on Thursday, if we can/should change the oil to 0-40. They spoke to shop foreman, he said if we do that, it could interfere/mask symptoms on the test. Seemed reasonable, so I requested we go ahead and do the inspection. Their hands are tied by GM, if they do it now, before my vehicle gets to “open status” (currently in “incomplete, remedy not available”), they don’t get paid.
My service advisor understands and empathizes with my dilemma. He is going to reach out to the district GM rep on Monday to see if they can open my VIN up to get this done before I leave (of course, if it fails, I’m begging for a loaner tow vehicle…). But, the advice from the Certified Master Tech is don’t change oil prior to inspection…