I know this topic has been discussed but I don't think with this oil. I have a 2014 Focus ST. 1st OC was at 1k using MC 5w30 Synblend. 2nd was at 3k using the same oil. 3rd OC was at 6k using Formula Shell Full Synthetic from BJ's. My oil temp gauge always stayed at the middle hash mark of the gauge with the MC oil. Today I noticed that gauge was noticeably below(about a 16th" below) that mark after the oil was well at operating temp. (45 mins of city driving with 2 good 5.5k turbo pulls). Can a different oil make THAT much difference in operating temps?