Best Synthetic Gear Oil 75w90

Michel | 20-02-2026

You will find our hand-picked selection of Best Synthetic Gear Oil 75w90 below. You have a wide variety of choices of brands such as Valvoline,Speedway Motors,ULTRA 1PLUS,Lucas Oil available to you as a result of the fact that each one of them has a unique pricing, look, and feel. Continue reading for an in-depth analysis in our Best Synthetic Gear Oil 75w90 buying guide!

Our experts tested a variety of Best Synthetic Gear Oil 75w90 on the market. Right at the top of the list is Valvoline Best Synthetic Gear Oil 75w90. Check out some more of our favorites below, and read some valuable insight from our experienced editors.

Editor's Choice
Valvoline FlexFill Advanced Full Synthetic Full Synthetic 75W-90 Gear Oil 1 QT FlexFill
Valvoline FlexFill Advanced Full Synthetic Full Synthetic 75W-90 Gear Oil 1 QT FlexFill
Premium Pick
Valvoline Flexfill SAE 75W-90 Full Synthetic Gear Oil 1 QT, Case of 4
Valvoline Flexfill SAE 75W-90 Full Synthetic Gear Oil 1 QT, Case of 4
Budget Pick
Valvoline SynPower SAE 75W-90 Full Synthetic Gear Oil 1 GA
Valvoline SynPower SAE 75W-90 Full Synthetic Gear Oil 1 GA

Top 10 Best Synthetic Gear Oil 75w90

We researched and compared the top products in the Best Synthetic Gear Oil 75w90 category to provide you with these recommendations.

1. Valvoline FlexFill Advanced Full Synthetic Full Synthetic 75W-90 Gear Oil 1 QT FlexFill

Valvoline FlexFill Advanced Full Synthetic Full Synthetic 75W-90 Gear Oil 1 QT FlexFill
9.8

Valvoline

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  • FlexFill squeezable pouch releases 2X more fluid with less effort for 3X faster filling vs. traditional bottle packaging
  • Contains limited slip for optimal performance of the clutch pack, while also delivering 30% better protection against towing and heavy loads and 1.5X better gear wear protection
  • Advanced full synthetic helps prevent noise and reduce chattering, while protecting gear teeth from wearing out prematurely
  • High and low temperature protection ranges from -50F to 300F degrees for cold temperature fluidity and high temperature performance
  • Fights rust and corrosion with corrosion inhibitors and safeguards against impurities, oxidation and thermal breakdown
  • Meets or exceeds requirements for: SAE J2380, MACK GO-J, Meritor 0-94 Rev Level A, API GL-5, GMW 16445; the addition of a supplemental friction modifier (Ford M2C-118-A, Chrysler MS-5630, or GM 1052358) is not required. Can be used in non-synchronized manual transmissions calling for API GL-4
  • American made and formulated, from the Original Motor Oil brand trusted for more than 150 years

2. Valvoline Flexfill SAE 75W-90 Full Synthetic Gear Oil 1 QT, Case of 4

Valvoline Flexfill SAE 75W-90 Full Synthetic Gear Oil 1 QT, Case of 4
9.5

Valvoline

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  • Works in tight spaces and makes gear oil easier to use
  • Full Synthetic formula for exceptional high and low temperature protection
  • Contains an extreme pressure additive for better load carrying capacity and wear protection
  • Excellent thermal stability designed to protect oil from high temperature breakdown

3. Valvoline SynPower SAE 75W-90 Full Synthetic Gear Oil 1 GA

Valvoline SynPower SAE 75W-90 Full Synthetic Gear Oil 1 GA
9.1

Valvoline

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  • Helps provide outstanding thermal stability for cleanliness and longer service life
  • Contains special additives to assist in protecting gear teeth from rust and corrosion and reduce chattering in limited-slip differentials
  • Recommended for conventional and limited slip differentials and non-synchronized manual transmissions where API GL-5 or API GL-4 fluid is specificed

4. Mobil1 1043611 Full Synthetic Gear Lubricant, 75W-90 Quart 6 PK

Mobil1 1043611 Full Synthetic Gear Lubricant, 75W-90 Quart 6 PK
8.9

Speedway Motors

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  • 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
  • Promotes outstanding power transfer performance - even in some of the most severe driving conditions
  • Sold as 6 pack

5. ULTRA1PLUS SAE 75W-90 Synthetic Gear Oil API GL-5 (Gallon - 4 QTS)

ULTRA1PLUS SAE 75W-90 Synthetic Gear Oil API GL-5 (Gallon - 4 QTS)
8.7

Ultra 1plus

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  • LONGER EQUIPMENT LIFE: 75W-90 GL-5 gear oil is formulated with synthetic base oils and specialty performance additives to provide high-temperature thermal and oxidative stability in a wide range of operating conditions.
  • ENHANCED PERFORMANCE IN DIFFERENTIALS: Engineered with specific limited-slip (LS) additives, it eradicates chatter, ensuring seamless functionality in limited-slip differentials for smoother, efficient operation.
  • MAXIMUM GEAR PROTECTION: Extreme pressure anti-wear additives safeguard gear teeth from shock loading and high torque, ensuring prolonged gear life and reduced maintenance needs.
  • ALL-WEATHER RELIABILITY: U1P 75W-90 Gear Oil guarantees excellent cold temperature flow, ensuring reliable operation in diverse weather conditions.
  • COST-EFFECTIVE MAINTENANCE SOLUTION: Exceeding performance benchmarks, it minimizes maintenance costs and extends equipment lifespan, providing a cost-efficient solution for diverse applications.

6. Lucas Oil 10047 SAE 75W-90 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart

Lucas Oil 10047 SAE 75W-90 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart
8.5

Lucas Oil

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  • Fit type: Vehicle Specific
  • Affordable solutions
  • Replaces OEM number: Lucas Oil: 10047
  • Excellent for use in limited-slip differentials
  • Packaging May Vary

7. STARFIRE SAE 75W-90 Full Synthetic Gear Lubricant – 5 GAL – Heavy Duty Gear Oil for

STARFIRE SAE 75W-90 Full Synthetic Gear Lubricant – 5 GAL – Heavy Duty Gear Oil for
8.3

Starfire

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  • BUILT FOR EXTREME GEAR PERFORMANCE STARFIRE 75W-90 full synthetic gear oil is engineered to handle the toughest conditionsresisting high loads, intense pressure, and severe heat to protect differentials and transmissions in heavy-duty applications.
  • EXTREME-PRESSURE PROTECTION Fortified with premium anti-wear additives to reduce gear scoring, pitting, and metal-to-metal contact under extreme loadsideal for hypoid gears and commercial fleet vehicles.
  • CORROSION & RUST DEFENSE Advanced inhibitors guard against oxidation, rust, and moisture-related damage, extending the life of gears and bearings even in harsh operating environments.
  • THERMAL & FOAM STABILITY Designed to maintain stable viscosity and resist foam under high-temperature operating conditions, ensuring reliable lubrication and quiet, smooth gear operation.
  • MEETS INDUSTRY-LEADING SPECS Formulated to exceed API GL-5 and MT-1 specs, and compatible with MIL-PRF-2105E/D, Mack GO-J/GO-H, and PG-2 limited slip differentialstrusted by professionals in automotive and heavy equipment applications.

8. Lucas Oil 10048 Synthetic SAE 75W-90 Gear Oil - 1 Gallon

Lucas Oil 10048 Synthetic SAE 75W-90 Gear Oil - 1 Gallon
8

Lucas Oil

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  • Heavy duty
  • High performance
  • Stands up to high temperatures

9. Mobil 1 Gear Oil, 75W90, Limited Slip Additive, Synthetic, 1 qt Bottle, Each

  • 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
  • Model Number : 104361-UNIT

10. ULTRA 1PLUS SAE 75W-90 Synthetic Gear Oil API GL-5 - Transmission and Differential Fluid (6 QTS)

ULTRA 1PLUS SAE 75W-90 Synthetic Gear Oil API GL-5 - Transmission and Differential Fluid (6 QTS)
7.7

Ultra 1plus

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  • LONGER EQUIPMENT LIFE: 75W-90 GL-5 gear oil is formulated with synthetic base oils and specialty performance additives to provide high-temperature thermal and oxidative stability in a wide range of operating conditions.
  • ENHANCED PERFORMANCE IN DIFFERENTIALS: Engineered with specific limited-slip (LS) additives, it eradicates chatter, ensuring seamless functionality in limited-slip differentials for smoother, efficient operation.
  • MAXIMUM GEAR PROTECTION: Extreme pressure anti-wear additives safeguard gear teeth from shock loading and high torque, ensuring prolonged gear life and reduced maintenance needs.
  • ALL-WEATHER RELIABILITY: U1P 75W-90 Gear Oil guarantees excellent cold temperature flow, ensuring reliable operation in diverse weather conditions.
  • COST-EFFECTIVE MAINTENANCE SOLUTION: Exceeding performance benchmarks, it minimizes maintenance costs and extends equipment lifespan, providing a cost-efficient solution for diverse applications.
1

Michel

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