I have been doing oil changes at 2,500 intervals myself and letting the dealer do the changes at 5,000 intervals. So for example, at 2,500 miles I did the oil change, at 5,000 the dealer did it. At about 7,500 I did it and at 10,000 the dealer will do it. At each oil change, I have noticed that after running the engine to operating temp, shutting off the engine and then waiting 5-10 mins per the owners manual, the oil on the dipstick is a bit above the recommended "MAX" level. Specifically, the oil appears to be not at the bottom of the upper "triangle" (holding the dipstick so that the yellow loop handle is pointing up and the bottom portion of the dipstick is pointing down at the ground) but actually slightly above the top or flat portion of the upper triangle. (I took a picture with my phone but the file size is too large and would not upload to the site.) When I fill the oil myself, I wind up putting in four full quart bottles of the Motorcraft 5w20 full synthetic and then adding enough oil to go down to the "20" mark on the side of the fifth quart bottle. I would note that after coming back from the dealer oil change the oil level is at the same level. So my question is: (1) am I and the dealer actually overfilling the engine slightly and (2) if so, am I running the risk of damaging the engine and/or losing some horsepower by doing so? Thanks for your help.