Went to my local Valvoline oil change place to get the oil changed out and they old me that they don't have 5W-50 full syn for my car. I then travelled to the Ford dealership and they changed my oil with Motorcraft 5W-50 syn. After all said and done the bill came out to 160 bucks. I asked them why so high and they told me my year GT500 takes 8 quarts of oil and each quart costs 15.99. Doesn't our cars take 6 and a half quarts?