So I did my first oil change this weekend. Looked up the oil capacity in my owner's manual and it said 4.3L. I'm not versed in liters to quarts so off to google I went. That's the equivalent of 4.5XX quarts. This did not seem right to me so I looked it up here. Thank goodness I did as I would have been baffled after tossing 4.5 quarts in and seeing nothing on the dipstick. Ended up putting about 5-3/4 quarts in her and she seems happy. Why would ford not have the ST oil capacity listed in the owner's manual? That capacity has to be for the non turbo I4. Engine seems to run a tad smoother and not as loud. Did any one notice this when changing from the stock oil to their oil of choice?