CRC Sta-Lube 85W-90 Gear Oil 1 Gallon — API/GL-4 Hypoid, Yellow‑Metal Safe, Anti‑Wear

Designed for automotive and light‑truck service, this Sta-Lube formulation combines low pour point performance with high temperature stability so moving gear surfaces stay lubricated in cold startups and under heat stress. Its formulation includes anti‑rust and extreme‑pressure (EP) anti‑wear additives to reduce wear and resist corrosion; the package size is a 1‑gallon bottle suitable for service bays and home shops. CRC emphasizes compatibility with non‑ferrous alloys, making this product appropriate where copper and bronze bushings or bearings are present.

How does CRC Sta-Lube 85W-90 perform in cold starts and hot running conditions?

This gear oil delivers fluidity at low temperatures and maintains viscosity at higher operating temperatures, so it circulates quickly on cold starts and retains protective film under load. That balance helps prevent metal‑to‑metal contact across typical automotive operating ranges without sacrificing shear stability.

• Low pour point for improved cold‑start circulation
• Stable high‑temperature viscosity to maintain film strength
• Formulated for hypoid gears and heavily loaded gearfaces

Is this product safe for transmissions and components made from yellow metals?

Yes — the Sta‑Lube blend is non‑corrosive to copper, bronze and other non‑ferrous bearing materials. That characteristic reduces the risk of dezincification or other corrosion issues that can occur with incompatible lubricants, making it suitable for mixed‑metal assemblies.

• Tested compatibility with copper and bronze components
• Reduces risk of corrosion in bushings and thrust washers
• Suitable for equipment using mixed‑metal internals

What applications are appropriate for this GL‑4 hypoid gear oil?

Sta‑Lube 85W‑90 meets API/GL‑4 performance for many standard transmissions and differentials in cars, trucks and buses. It’s intended for service where GL‑3 or GL‑4 oils are specified and where EP protection and rust resistance are required.

• Manual transmissions requiring GL‑4 performance
• Hypoid differentials and drive axles with moderate loads
• Fleet and repair shop use where yellow‑metal compatibility matters

What protective additives are included and what do they do?

The formula contains anti‑rust agents and EP anti‑wear additives that form a protective boundary film on gear surfaces under pressure. These additives help minimize wear during shock loading and protect metal surfaces from corrosion when moisture or contaminants are present.

• EP additives reduce scuffing and pitting on gear teeth
• Anti‑rust components inhibit corrosion in idle or humid conditions
• Designed for consistent performance across changing service conditions

Who is this for: CRC Sta‑Lube 85W‑90 API/GL‑4 gear oil suits professional mechanics, fleet maintenance crews, and DIY technicians who need a reliable, yellow‑metal safe hypoid oil for manual transmissions, differentials, and drive assemblies. Choose this product when your equipment requires GL‑4 performance, you want broad temperature capability from one fluid, and compatibility with copper or bronze components is important.