I'm at 6k miles on my Royal Purple 5w30 synthetic. Looks fine and I'm not down any oil. Gas mileage has not changed. I get around 33mpg highway. Unless it happens again, I'll wait another 1500 miles (week or two) and get the oil changed and tell the dealer. Can they pull any codes since it was more of a stall and not a steady CEL?
I'll see how it does on my 180 mile trip again tomorrow.