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Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity

i just got a truck.is a Ford f-650 and has a 10.4 liter diesel by Caterpiller.it already has twin turbo to boot.the previous owner used 90 weight oil in the engine.although the motor is being rebuilt i just need a good direction to go when selecting the proper motor oil.any good help would be appreciated.
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