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2011 Ford, 118,000 miles with Ford's semi syn diesel oil every 5-6000 miles. It's changed at a Ford dealership as I still have kept an extended warranty on this very early build 6.7 JOB 1 truck. Oil filter changed every change along with tire rotation. Fuel filters changed at 15-20,000 or after a 6-8000 mile trip. The waste oil is not very diert when it's compared to my diesel tractor Rotella oil that comes out about the color of road tar after 50 hours. I have used full synthetic oil on earlier cars and trucks and have seen zero difference in fuel mileage to cost of driving.
The only oil I have ever used with poor results is Castrol which seemed to run straight through the filler to the tail pipe, having to add 2-3 quarts in 5K miles between changes vs none for Mobil 1 or Ford semi syn
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Dave W
2014 Montana High Country 343RL (Sold!)
2011 Ford 6.7 Lariat CCLB (Went to PU Heaven)
2019 F150SC XLT SE Sport,w/full tow package
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