Best 75W 90 Synthetic Gear Oils in 2026

ADVANCED PROTECTION AGAINST the four main causes of engine breakdown: wear friction heat and deposits

40% BETTER WEAR PROTECTION vs. industry standard as tested in the Sequence IVB engine test

25% BETTER DEPOSIT PROTECTION with superior engine cleaning detergents as tested in the GMOD engine test

HIGH PERFORMANCE - Gear protection and longer synchro life. Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified

OFFERS QUICKER SHIFTS - Excellent gear and synchro protection, balanced friction control & slipperiness for easier shifting even in cold climates

SAFE FOR BRASS SYNCHROS - GL-4 Gear Oil lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications

Mobil 1 Synthetic Gear Lube Ls 75W-90 Mobil 1 Synthetic Gear Lube Ls 75W-90 Is A Supreme Performance, Synthetic, Multi-Purpose, Sae 75W-90 Automotive Gear Lubricant Designed To Meet The Highest Level Of Performance Requirements Of Modern Passenger Vehicles In All Types Of Operating Conditions, Including Limited Slip Applications, As Well As Delivering Outstanding Power Transfer Performance

Compared To Conventional Hypoid Gear Lubricants, Mobil 1 Synthetic Gear Lube Ls 75W-90 Performs Exceptionally Well Over A Wide Range Of Temperatures

Through Creativity, Productivity And Innovation - This Brand Continues To Develop The Finest Automotive Accessories

Item Package Dimension 8.49999999133L x 3.99999999592W x 3.99999999592H inches

Item Package Weight - 1.69976404002 Pounds

Item Package Quantity - 1

Case of 3 // 1 Quart (32 Ounces)

Royal Purple engineered this ultra-tough, high performance automotive hypoid gear oil to provide maximum protection to heavily loaded gears while maximizing power throughout the drive train. Max Gear outperforms ordinary gear oils by combining the highest quality synthetic oils with Royal Purple’s proprietary Synerlec additive technology.

Maximizes horsepower, Extends gear and bearing life, Reduces operating temperature, Severe service performance, Lower coefficient of friction, Superior corrosion protection

Package Dimensions: 5.08 H x 25.907 L x 13.208 W (centimeters)

Country of Origin : United States

Fit type: Vehicle Specific

Specifically designed for the lubrication and service of model year 2007 and newer manual transmissions and transfer cases

Product already contains a limited slip friction modifier

No need to use a top treat additive

Affordable Solutions

Provides rust protection

Ideal for shock loading applications

Castrol GTX Full Synthetic Motor Oil provides maximum protection to help fight the impact of severe conditions that can potentially shorten engine life

Castrol GTX Full Synthetic has been proven to dramatically reduce engine wear - 6X better than the industry standard

1.3X better sludge protection than industry standards

Provides maximum protection against excessive wear, corrosion and pitting for extended gear life in marine applications

Contains additives to protect gears if water enters the gearcase or lower unit

Recommended for use in outboard motor gearcases and marine lower units in applications below 75hp

Fit type: Vehicle Specific

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

Country of Origin : China

Mobil 1 Synthetic Gear Lube LS is a supreme performance, synthetic, multipurpose, automotive gear lubricant

Meet or exceed the highest level of performance requirements of many modern passenger vehicles – including limited slip applications

Helps protect against thermal and oxidative degradation, wear and corrosion, and viscosity loss associated with premature shearing

For manual transmissions, transaxles, rear axles, hypoid gearing

Provides superior wear protection and significant noise reduction

For easier shifting and quieter operation

SUPERIOR PERFORMANCE - High viscosity synthetic blend 80W-90 gear oil, designed for API GL-5, MT-1 service SAE J2360, and Mack GO-J

LONG TERM PROTECTION - Ideal for all engines over 100 hp, our gear oil provides exceptional long-term protection against rust and corrosion, extending your engine's lifespan

EXTREME PRESSURE ADDITIVES - Special additives ensure great thermal stability and anti-wear protection, even under high temperature conditions

✅ Pressure Ready - Our 75W-90 oil was made to deal with extreme pressure and shock loading, providing load-carrying capability that won’t let you down.

✅ Proprietary Blend - We blend high-performance synthetic components to create a proprietary solution for guaranteed performance.

✅ Fully Synthetic - Full synthetic motor oil means longer lasting high-performance vehicles with a cleaner filter and fewer oil impurities.

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.

Exceeds API GL-5 Specifications

High Temp High Shear Stability

Made in the USA

Greater wear protection for severe service performance

High temperature performance low temperature fluidity

Excellent water separation which prevents corrosion