I had a question on the amount of oil during oil change. The last time I had the dealer change my oil, they over-filled it (They put 7 quarts and change in) Now, I want to take my own oil in for the next change (Mobil Syntec 5w-30). Does anyone know how many quarts I should give to the dealer? Should I give them 6 quarts and add any increments myself at a later time??