Axle lubricant is a specification item, not a place to substitute whatever is on the shelf. The 75W-85 viscosity called out for these axles is thinner than a traditional 75W-90, which is part of how the factory manages both efficiency and gear noise, and using a heavier oil can change how the axle sounds and feels when cold. This is the genuine Mopar synthetic specified for the application.

Lubricant Specifications:

• 75W-85 synthetic gear lubricant meeting GL-5 performance requirements.
• Applications include 2011-2016 Jeep Grand Cherokee WK2 and Dodge Durango.
• Supplied in a 32 ounce quart bottle, sold individually.
• Supersedes part numbers 5136035AA, 5136035AB and 5136035AC.
• Contains hazardous material, so ground shipping restrictions and extra charges apply.