AI overview from a Google search returned this. Cannot confirm the validity of the information though. (Your pic shows 10-4122 as GL-5 for instance.)
All three of these ACDelco products are 75W-85 gear oils, but they differ significantly in additive packages, viscosity specs (API GL-4 vs GL-5), and vehicle applications.
The main differences are outlined below:
1. ACDelco LV Dexron 75W-85 (Part No. 10-4122)
- API Classification: GL-4
- Attributes: This is a low-viscosity (LV), synthetic-blend fluid specifically formulated for high-speed, low-load gear applications. It is frequently used in GM vehicles (especially 2009 and newer trucks/cars) that are factory-equipped with specific GM axles.
- Application: Used in both front and rear differentials on specific GM trucks and SUVs, often depending on which manufacturing supplier (e.g., GM versus AAM) provided the axle.
2. ACDelco 75W-85 Rear Axle Lubricant (Part No. 10-4032)
- API Classification: GL-5
- Attributes: This is a full-synthetic final drive lubricant. It is highly suited for high-torque applications and includes specific friction-modifier properties.
- Application: Specially recommended for ZF limited-slip differentials with carbon linings (such as the 2008–2009 Pontiac G8).
3. ACDelco Gold LV Dexron 75W-85 (Part No. 10-4129)
- API Classification: GL-5 / GL-4 (Dual-rated depending on package)
- Attributes: Part 10-4129 is part of the ACDelco Gold tier, meaning it is a high-quality, premium aftermarket replacement part designed to meet or exceed GM OE standards. This is typically formulated to handle extreme pressures and is optimized for thermal stability and wear prevention.
- Application: Serves as a versatile, premium alternative for standard GM drivetrains and axles requiring 75W-85 weight gear oil.
