Best Lucas Gear Oils in 2026

Better protection

Improved performance

Quality you can trust

For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual

Minimizes metal-on-metal wear

Quiets engines

Brand: Royal Purple

LTDType: Synthetic

Viscosity: 75W-90

Superior lubricity minimizes sliding friction for maximum power.

42 Percent Better Rating On Fighting Power Robbing Deposits

Superior Engine Protection Vs Conventional And Synthetic Blend Oils

Superior Performance Against Deposits, Wear And Oxidation; Bottle Color: Black

Lower unit gear oil formulated to protect against corrosion and excessive wear

Designed for outboard motor lower unit and sterndrive applications above 75 HP

Extreme pressure synthetic additives protect gears from metal to metal contact

Package Dimensions: 28.956 H x 8.128 L x 8.382 W (centimetres)

Package Weight: 0.93 kilograms

Country of Origin : United States

Fit type: Vehicle Specific

Package Dimensions: 30.48 H x 16.51 L x 16.51 W (centimetres)

Country of Origin : China

Exceeds API service classifications GL-5 and GL-4

High shear strength resists viscosity breakdown under the most severe conditions

Special additives protect against wear, scuffing and corrosion

Fit type: Vehicle Specific

Package Dimensions: 31.0 H x 15.0 L x 15.0 W (centimeters)

Country of Origin : China

Extra gear protection in extreme shock loading conditions

WIDEST SPEC RANGE ON THE MARKET: widely compatible with a very large number of hypoid gear systems, differentials, transmissions and axle assemblies.

SEVERE SERVICE MAX: Exceptional shear stability and oxidation resistance. Polyphosphate EP proprietary additive system offers substantial improvement in performance over previous generation, low cost, gear oils

BUILT IN LIMTED SLIP ADDITIVE - Does not require "additional" LS additive. Its built into the product, optimized for all limited slip differentials, including those with built in wet brakes.

Specs: Description: Hydraulic Oil and Stop Leak, Adds life to pumps, rams and seals, Adds lubricity and thermal stability to any hydraulic oil, Automatic transmissions: use approx. 10% to stop slip, leaks, rough shifting and over-heating; up to 30% in worn units, Construction equipment: use approx. 5%-10% for preventative maintenance; up to 20% to correct heat, leaks and fading in older equipment, Hydrostatic drives: use approx. 10% for more hydraulic pressure and less gear wear;

Replaces OEM Numbers: Lucas Oil: 10018

Stens 1 year warranty ensures reliability and performance for every part. We're confident that our products will work flawlessly, but in a rare case that it does not, we'll replace it anytime within one year of your order.

Genuine Arctic Cat Product, OEM Part Number: 6639-539

Designed for Arctic Cat chain-driven snowmobiles with reverse. Synthetic formulation helps protect against wear at extreme temperatures.

Inhibits rust and corrosion during periods of non-use or extended storage.

Meets American Petroleum Institute (API) GL-5 specification for use in severe conditions

Formulated for improved fuel efficiency, lower axle temperature operation, and improved thermal stability

High-quality product is suitable for both car and truck axles

Product Type:Auto Part

Item Package Dimensions:30.226 cm L X 10.414 cm W X 9.144 cm H

Item Package Weight:1.899 lbs

Excellent wear protection

Smooth clutch and pto performance

Excellent anti-shudder performance