What type of gear oil do the differentials in the MTVR use?

The differentials in the Medium Tactical Vehicle Replacement (MTVR) are designed to operate with gear oil that has a viscosity rating suitable for the operational conditions expected of military vehicles. The correct choice, which specifies GO 80W-90, is advantageous because this oil provides a good balance of viscosity and performance, ensuring that the differentials are adequately lubricated under various temperature conditions.

The 80W-90 gear oil offers sufficient fluidity at lower temperatures for cold starts while maintaining adequate thickness at higher operational temperatures. This viscosity helps protect the differential components from wear and provides optimal performance during both on-road and off-road driving conditions, which are common in military operations.

In contrast, the other viscosity ratings mentioned may not provide the same balance required for the MTVR's operational demands, which can lead to insufficient lubrication or failure to perform effectively under certain conditions. Thus, using GO 80W-90 gear oil is essential for maintaining the longevity and reliability of the differential systems in the MTVR.