Oil changes for both my domestics yesterday/today too. Found cracked motor mounts on the Denali, parts are fairly cheap but front diff has to be removed and engine has to be lifted, 9.7 hrs book time - ouch! Called the dealer to see if there might be a service bulletin/recall, my 75K mile vehicle exceeded its 5 yr/100k power train warranty 13 days ago. Due to my frequent buying history, dealer is trying to get my warranty extended by one month to cover it, otherwise oh crap.