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Dealers will tell you to change the oil more often than necessary because it means $$$ in their pockets.
Today's synthetic blend and pure synthetic blend oils coupled with engines running cleaner and cooler can go longer than the old 3000 - 5000 mile oil changes when used for normal driving conditions so running 7500 miles on an oil change is not a problem.
Now if you drive in very dusty conditions, tow a heavy load continually, run in extremely hot conditions, etc. then 5000 miles between changes would be recommended.
If I were you, I would change your oil once per year.
My 2020 Magnitude is on the F-550 with the 6.7 PowerStroke Diesel. The computer tells me when to change the oil. It has been almost a year and my Change Oil Reminder just came on and I am probably around 7000 miles since it was changed.
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