1972 USA Owners manual (Page 22 ... 24):
Selecting the right lubricants ...
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Overview
See: * Capacities * Engine Oil Specifications * Differential_Lubricant (gear lube) * Transmission Gear Oil * Steering Gearbox Gear Oil * Coolant (antifreeze/coolant for Radiator) * Chassis Lube "Grease job" * Other Lubricants
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Gear Oil Viscosity
Gear oil is used in the Transmission, Steering Gearbox, and Differential.
1982 Nissan Recommendations - Datsun Sunny
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Engine Oil Viscosity
Choose the engine oil by the climate in your area.
See main article: Engine Oil Specifications