It's time for another oil change in my 1997 F350. It has a 460 gas engine and the ZF-5 manual transmission. It now has just over 21,000 original miles and I want to change the oil again before winter. I did the last change with Rotella T5 and a Motorcraft filter, but would like to go full synthetic this time and more than likely keep it that way. I don't mind paying extra and changing oil more often than I should; I bought the truck in March off of ebay, flew out to get it and drove it 1200 miles home- paid more than I should've for it and want to keep it as nice as possible. It's not a daily driver, but drive it just because on the weekends or to haul a bed of stone or wood, pull a boat or trailer 3k-9k, etc.
I have been considering Rotella T6 5w40 or Mobil 1 Truck & SUV 5w30. The T6 is 19.xx for a gallon at Wally World, while the Mobil 1 is 24.xx for 5qt jug, so they're right about the same price.
What would you suggest? I know both are good products. Thanks!!
I have been considering Rotella T6 5w40 or Mobil 1 Truck & SUV 5w30. The T6 is 19.xx for a gallon at Wally World, while the Mobil 1 is 24.xx for 5qt jug, so they're right about the same price.
What would you suggest? I know both are good products. Thanks!!

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