Are you sure the dealer was putting 8 quarts in? Any time I have them change oil, I always confirm with them that they're putting 8 quarts in of 20w synthetic. When you say "way high" on the dipstick, how high is way high? There will be some oil in the oil cooler that won't come out with an oil change, but that's alright. The owner's manuals say to add 8.5 quarts, which would cause a high reading on the stick. It won't hurt anything but they put out a bulletin that says it's ok to just use 8. Sent from my SM-J810F using Tapatalk