You will find our hand-picked selection of Best Synthetic Gear Oil below. You have a wide variety of choices of brands such as Valvoline,Cam2,Triax,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 buying guide!
Our experts tested a variety of Best Synthetic Gear Oil on the market. Right at the top of the list is Valvoline Best Synthetic Gear Oil. 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
Premium Pick
Valvoline Flexfill SAE 75W-90 Full Synthetic Gear Oil 1 QT, Case of 4
Top 10 Best Synthetic Gear Oil
We researched and compared the top products in the Best Synthetic Gear Oil category to provide you with these recommendations.
1. Valvoline FlexFill Advanced Full Synthetic Full Synthetic 75W-90 Gear Oil 1 QT FlexFill
- 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
- 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. CAM2 80W-90 LS GL-5 Gear Oil, 5 Gallon Pail
- PREMIUM GEAR OIL: CAM2 80W-90 LS GL-5 gear oil formulated for superior protection of automotive differentials and manual transmissions requiring GL-5 specification
- LIMITED SLIP FORMULA: Contains special friction modifiers designed specifically for limited slip differentials to prevent chatter and ensure smooth operation
- HIGH PERFORMANCE PROTECTION: Provides excellent wear protection, thermal stability, and oxidation resistance for gears operating under severe conditions and heavy loads
- BULK QUANTITY: Comes in a convenient 5 gallon pail, ideal for workshops, fleet maintenance, or multiple vehicle applications
- VERSATILE APPLICATION: Suitable for use in rear axles, manual transmissions, and other gear systems in cars, trucks, and performance vehicles where 80W-90 GL-5 oil is specified
4. Valvoline FlexFill Advanced Full Synthetic Full Synthetic 75W-140 Gear Oil 1 QT FlexFill
- 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
- High and low temperature protection ranges from -50F to 300F degrees for cold temperature fluidity and high temperature performance
- Advanced full synthetic helps prevent noise and reduce chattering, while protecting gear teeth from wearing out prematurely
- Fights rust and corrosion with corrosion inhibitors and safeguards against impurities, oxidation and thermal breakdown
- Meets or exceeds API GL-5, Ford M2C-192A, GM 12346140, Chrysler MS-8985, and where GL-5 SAE 75W-140 gear oil is specified. The addition of a supplemental friction modifier (Ford M2C-118-A, Chrysler MS-5630, or GM 1052358) is not required
- American made and formulated, from the Original Motor Oil brand trusted for more than 150 years
5. TRIAX Synergy Gear Max 75W-90 GL-5 Limited Slip, Ultra Long Drain 500k Miles, Manual Transmission,
- EXTREME DRAIN INTERVALS: PAO and Esters formulation lasts up to 500,000 miles for heavy-duty trucks and passenger cars, and 750,000 miles for Class 8 highway trucks
- OUTSTANDING PERFORMANCE: Better protection than 99% of the other gear oils on the market, including major brands/OEM fluids, and is nearly shearless, ensuring it will not break down under extreme conditions
- EXCELLENT WEAR CONTROL: Up to 62% less wear than OEM specifications across various standards, exceptional load-bearing capacityexceeding the highest Stage 14 load test ratingwhile effectively preventing gear pitting, scuffing, and glazing
- EXCEEDS EP, AW TESTS FZG & L-37: Proven protection far beyond spec requirements, delivers excellent extreme pressure (EP) and anti-wear (AW) performance in a wide range of LS and NON-LS gear systems, with hypoid and other gears
- FOR USE IN: Hypoid and ring gears, differentials, limited slip, heavy duty highway, passenger cars, heavy duty off-road, racing/drifting
- UNMATCHED QUALITY & OEM SPEC COVERAGE: Meets and exceeds API GL-5 and limited slip requirements, and a wide range of specifications across multiple OEMs; Compatible with MT-1 MIL PRF-2105E, Mack GO-J PLUS SAE J2360 Eaton Roadranger E500, ZF TE-ML 07A/08, Dana SHAES 429, 256 Rev. C Meritor O-76N MB-Approval 235.8 International TMS-6816 ZF TE-ML 05B/16F/21B ZF TE-ML 12B Voith Turbo 132.00374401 / 132.00374402 U.S. Steel Specification 224
6. Lucas Oil 10047 SAE 75W-90 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart
- Fit type: Vehicle Specific
- Affordable solutions
- Replaces OEM number: Lucas Oil: 10047
- Excellent for use in limited-slip differentials
- Packaging May Vary
7. Mobil1 1043611 Full Synthetic Gear Lubricant, 75W-90 Quart 6 PK
- 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
8. STARFIRE SAE 75W-90 Full Synthetic Gear Lubricant – 5 GAL – Heavy Duty Gear Oil for
- 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.
9. Lucas Oil 10048 Synthetic SAE 75W-90 Gear Oil - 1 Gallon
- Heavy duty
- High performance
- Stands up to high temperatures
10. Valvoline Advanced Full Synthetic 75W-90 Gear Oil 1 QT
- High-performance additives deliver 1.5X better gear wear protection
- High and low temperature protection ranges from -50F to 300F degrees for cold temperature fluidity and high temperature performance
- Contains limited slip for optimal performance of the clutch pack, while also providing 1.5x stronger extreme pressure protection and 30% better protection against towing and heavy loads
- Advanced full synthetic helps prevent noise and reduce chattering, while protecting gear teeth from wearing out prematurely
- 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
Peter
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