Dodge D250 1990 Service Manual page 72

Lubrication and Maintenance
DODGE Turbo Diesel
Recommended Lubricants, Fuels and Fluids
PageOH-3
9, Transfer Case (NP-205)*
Multipurpose Gear Oil (A.P.I. specification GL-5 or engine oils labeled A.P.I. Service S F / C C or SF/CD)
SAE Viscosity Grades - Multipurpose Gear Oils
If the anticipated minimum atmospheric temperature will be:
Use SAE 140 Above 32°C[90oF]
Use SAE 90 32°C [90°F] to -23°C [-10°F]
Use SAE 80 Below-23°C [-10°F]
SAE Viscosity Grades - S G or S G / C D Engine Oil
Use SAE 50 Above 0°C t32*F]
Use SAE 30 Below 0°C [32°F|
* Use the Lubricants and Coolants listed or Lubricants and Coolants containing equivalent properties.