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Just make sure the oil does not have any friction modifiers. Most 5W and many 10W oils are marketed to improve gas mileage...they have friction modifiers. One automobile/truck oil that is OK is Rotella T full synthetic. You can buy it by the gallon from WalMart or most auto parts stores. Wet clutches do not like oil with friction modifiers since the clutch plates themselves rely on friction to work.
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