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10-30 and later 5-30 were specified because those oils were used in EPA testing (fuel economy) and the manufacturer is not supposed to use one oil for testing purposes and another for general use. The heavier oils are listed in other markets, IE OZ where I believe the charts list up to 20-50.
The lighter oil in theory provides better fuel economy.
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Original owner 93 FZJ80,locked,blown,water/methanol injected(like a WWII fighter aircraft),lifted,winched,snorkeled,slidered,Sleeed ,moneypit. Balanced on a pin head. 95 FZJ80 trail truck (hers), 94 FZJ80 320K with a knock and a lumpy old Dodge car. 
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