Dealerships can be sketch... I have to bring one quart less than required and tell them I will top up at home, otherwise they overfill every time. #AMSOIL hangs up in the engine longer and they normally don't let it drain completely (like for 30 minutes) and then put in the normal amount of oil. When I get home and let the engine cool it's overfilled. I guess most people don't care. One thing about DIY maintenance is you know exactly what is going on.