The maximum tightening torque for a slightly lubricated 1" Grade 5 coarse bolt is 483 lbf ft. Dry bolt torque is approximately 30% higher - or 628 lbf ft.
Tdry = (483 lbf ft) (1 + (30%) / (100%))
= 628 lbf ft
If the bolt is lubricated with SAE 30 oil - the torque compared to a dry bolt is reduced with approximately 40%.
TSAE30 = (628 lbf ft) (1 - (40%) / (100%))
= 377 lbf ft
Note that if torque specified for a dry or slightly oiled bolt torque is applied to a lubricated bolt - the bolt may overload and break.
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