Alright, I decided on Mobil 1, 5w30 which I think for street use will work out fine. Question, I put 6 quarts in with a new Motorcraft FL820 oil filter and the dip stick looks about 1/2 quart low. Is this normal? Do these actually require 6 1/2 qts. with filter change? Should I add 1/2 or leave...