So since joining here I can't decide on which oil would suite the 11' Focus of mine. Now, I am debating on using some M1 5w20, M1 5w20 EP or some Casteol synthetic in the gold jug. Was contemplating also PU. What say you folks. Car see's mainly 98% highway driving and few short trips on weekends also. 59k on car at present and well cared for.