This 7,000 mile OCI was done in a 2 month period, obviously mainly highway. As for history the factory fill was replaced by the dealer at 2,000 miles with their shop conventional 5W-30. I replaced that at 3,200 miles of use right before our trips with the Mobil 1 5W-30 which was at 5.200 miles on the odometer. The Mobil 1 5W-30 was run for 7,000 miles. Since I had Motorcraft 5W-30 on hand I will use that for next 5,000 miles and change back to Mobil 1 5W-30 which I've been stocking up with their rebates
Whimsey