I am looking at changing my CX9 over to synthetic this weekend. its a 3.7L. Manual recommends 5w-20 year round. I am trying to decide between Mobil 1 5w-20 EP or Mobil 1 0w-20. I cant seem to find a VOA on the AFE 0w-20. So what does everyone think. The new girl has 23000 miles. I have been starting her all week in -25 weather to go to work by the way. In my part of town the temperature ranges from -25 winter to 95 summer, with extremes to -35 to 105.