I feel my receipt should be recalculated, it was way to much for an oil change & coolant flush / refill. over $ 300.00, ridiculous. And if my transmission doesn't have a drain plug, I would say that means it's a sealed unit, not to charge customers over $ 500.00 to drop the pan and mess with my factory sealed TRANSMISSION. so there for it probable will never be done, unless you guys float the bill. Just because I have a GMC does not mean I'm loaded with money. my loyalty brings no discounts to my mailbox, something to think about in these times.