Overview
The Lucas Oil Synthetic SAE 75W-140 Gear Oil, part number LUC10122, is a pure synthetic gear lubricant with a 75W-140 viscosity grade. It is designed for heavy duty and high performance gear applications where conventional gear lubricants may not hold up, and it is universal fit.
The additive package increases lubricity, which reduces gear noise and supports longer bearing life. The oil stays stable at high temperatures without losing lubricity, and it is suited to limited slip differentials.
Key features
- Pure synthetic gear oil, SAE 75W-140
- Special additive package that increases lubricity
- Reduces gear noise and extends bearing life
- Designed to hold up at high temperatures
- Described by Lucas Oil as excellent for limited slip differentials
Choosing a gear oil
Gear oil does more than reduce friction. In a differential or manual transmission it carries heat away from the gears and bearings, and it keeps a film on metal surfaces under heavy load. Viscosity matters because it sets how the oil flows when cold and how well it holds up when hot. A 75W-140 grade is a common choice for axles that work hard, but the right grade is the one your axle is designed for.
Limited slip differentials put extra stress on the clutch packs, so the fluid needs to protect friction surfaces as well as gears. When changing gear oil, look at the drain plug magnet for metal flakes, and check the seals and vent for leaks. Pure synthetic oils tend to keep their viscosity across a wide temperature range, which is useful on trails and during towing.
Specifications
| Brand | Lucas Oil |
|---|---|
| Part number | LUC10122 |
| Viscosity | SAE 75W-140 |
| Type | Synthetic gear oil |
| Fitment | Universal fit |
Vehicle fitment
It is universal fit, so no specific vehicle, axle or year is named. Confirm fit against your differential or transmission fluid specification before using it in a particular axle.
Confirm your vehicle’s year, model and trim before ordering.
