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According to the amsoil lookup, you need 5W-30 motor oil and not the syncromech tranny fluid.
That's because the amsoil lookup is not smart enough to understand the manufacturer's specification written 20 years ago has been superceded by contemprary lubrication technology, as alluded to above.
As an Amsoil rep and site sponsor you should be aware of these issues and be giving appropriate advice to the members here, Heath.