after 5 months of going back and forth over buying a sho I finally did. 2013 pp with nav and bliss nice car especialy coming from a 2010 gmc sierra crew.Now for the new guy questions. The dealer uses semi synthetic instead of full synthetic. Oil change every 3250 miles offers every other service free. Should I go with that or switch to synthetic every 5000 miles? What about the trans and ptu and tire rotation? thanks