| Product Code | Package Size | Unit of Measure |
|---|---|---|
| SVLPK-EA | Quart Easy-Pack | Each |
| SVLPK-CA | Quart Easy-Pack | Case of 12 |
AMSOIL SEVERE GEAR 75W-85 100% Synthetic Gear Lube delivers advanced wear protection, lower operating temperatures, and extended drain intervals for differentials, manual transmissions, and transfer cases in trucks, SUVs, and other vehicles that spec a 75W-85 gear oil.
Modern drivetrains push gear oil harder than most people realize. Higher horsepower ratings, heavier towing capacities, and tighter component tolerances create extreme pressure and heat inside differentials and gear housings. Conventional gear oils break down under these conditions, losing viscosity, forming acids, and allowing metal-to-metal contact that accelerates wear. A 75W-85 synthetic gear lube built for severe duty changes the equation entirely.
CONTROLS THERMAL RUNAWAY
Thermal runaway happens when a gear oil can't keep friction and heat in check. Temperatures climb, the oil thins out, friction increases further, and the cycle feeds on itself until the lubricant degrades rapidly and components suffer damage. AMSOIL SEVERE GEAR is formulated to interrupt that cycle by maintaining viscosity stability under high-stress, high-heat conditions. This keeps differential and transmission temperatures lower and prevents the cascading failure that conventional oils allow.
IRON-SULFIDE BARRIER COATING FOR WEAR PROTECTION
Proprietary AMSOIL additives form an iron-sulfide barrier coating directly on gear surfaces. This coating acts as the last line of defense against wear, pitting, and scoring under extreme pressure. For vehicles used in towing, hauling, steep-hill driving, off-road use, or frequent stop-and-go operation, this level of protection keeps ring-and-pinion gears and bearings intact over far longer service intervals than conventional gear oil can support.
EXCELS IN TEMPERATURE EXTREMES
SEVERE GEAR 75W-85 resists breakdown from high heat, preventing the formation of acids and carbon/varnish deposits that shorten component life. On the cold side, its wax-free synthetic construction provides superior cold-flow properties compared to conventional 75W-85 gear oils. That translates to improved cold-weather shifting in manual transmissions, reduced drag in differentials during cold starts, and better fuel economy in low-temperature conditions. The pour point of -45°F (-43°C) keeps this oil flowing in severe winter environments.
EXTENDED DRAIN INTERVALS
One of the real advantages of SEVERE GEAR is how long it lasts. In cars, SUVs, and light trucks under normal service, drain intervals extend to 100,000 miles (161,000 kilometers) or per the owner's manual, whichever is longer. Severe service cuts that to 50,000 miles (80,500 kilometers) or per the owner's manual, whichever is longer. For heavy-duty Class 8 line haul trucks, SEVERE GEAR supports OEM synthetic drain intervals up to 250,000 miles (402,500 kilometers) or three years. Vocational and delivery applications go up to 120,000 miles (193,200 kilometers) or three years. Heavy-duty off-road equipment is covered up to 100,000 miles or two years. These intervals reduce maintenance costs and downtime significantly.
BUILT-IN FRICTION MODIFIERS FOR LIMITED-SLIP DIFFERENTIALS
SEVERE GEAR 75W-85 contains friction modifiers compatible with most limited-slip differentials, eliminating chatter without the need for a separate additive in most applications. For limited-slip differentials that require additional friction modifier, AMSOIL Slip Lock can be added.
RUST AND CORROSION PROTECTION
Gear housings are vulnerable to moisture intrusion, especially in vehicles that see wide temperature swings or sit idle between uses. SEVERE GEAR provides strong rust and corrosion inhibition, protecting internal surfaces and extending equipment life even in demanding environmental conditions.
Specifications and Compatibility
AMSOIL SEVERE GEAR 75W-85 (SVL) is recommended for differentials, manual transmissions, and other gear applications requiring any of the following specifications: API GL-5/MT-1, MIL-PRF-2105E, SAE J2360, Ford WSD-M2C85-NL, GM 19300456, 19415301, 82156200, 19349642, Ram 4521056AB, 4506933-1AA, 4934825-6AA, 4523285-6AB, 4536582-8AA, 05134035AC, and Toyota Genuine Gear Oil LT 08885-02506.
This product is compatible with conventional and synthetic gear oils. Mixing with other oils, however, will shorten oil life and reduce performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.
Popular applications include the Toyota 4Runner, Tacoma, and Tundra differentials, Chevy Silverado 1500 and GMC Sierra 1500 front and rear differentials, Ram 1500 differentials, and other vehicles specifying a 75W-85 GL-5 gear lube.
Typical Technical Properties
| Property | AMSOIL SEVERE GEAR 75W-85 (SVL) | Test Method |
|---|---|---|
| Kinematic Viscosity @ 100°C, cSt | 13.3 | ASTM D445 |
| Kinematic Viscosity @ 40°C, cSt | 63.6 | ASTM D445 |
| Viscosity Index | 163 | ASTM D2270 |
| Brookfield Viscosity, cP @ (°C) | 30,364 (-40) | ASTM D2983 |
| Flash Point, °C (°F) | 220 (428) | ASTM D92 |
| Pour Point, °C (°F) | -45 (-49) | ASTM D97 |
| Copper Corrosion @ 121°C (250°F) / 3hr | 1b | ASTM D130 |
| Foam Stability (Seq I/II/III) | 0/0, 10/0, 0/0 | ASTM D892 |
What vehicles and equipment use AMSOIL SEVERE GEAR 75W-85 synthetic gear lube?
AMSOIL SEVERE GEAR 75W-85 100% Synthetic Gear Lube (SVLPK) is excellent for all cars and trucks, but is especially well-suited for towing, hauling, racing, commercial use, and other severe-duty applications. It covers a wide range of equipment categories including auto/light truck, motorcycle, ATV, UTV, snowmobile, marine outboard, PWC, heavy-duty on-road, heavy-duty off-road, and agriculture. Verified users report using it in 2014–2018 Chevy and GMC 1500 differentials and 4WD transfer cases, among other applications.
How does AMSOIL SEVERE GEAR 75W-85 protect gears during heavy towing and hauling?
AMSOIL SEVERE GEAR 75W-85 is engineered with high film strength to meet high-load demands, reducing friction and providing ultimate protection against wear. Proprietary AMSOIL additives form an iron-sulfide barrier coating on gear surfaces, defending against wear, pitting, and scoring. It also helps prevent thermal runaway — a phenomenon where a lubricant cannot control friction and heat under high-stress conditions — by inhibiting rapid lubricant degradation and component damage.
What does the iron-sulfide barrier coating in AMSOIL SEVERE GEAR 75W-85 gear oil do?
The iron-sulfide barrier coating is formed by proprietary AMSOIL additives directly on gear surfaces. It serves as the ultimate line of defense against wear, pitting, and scoring by creating a protective layer between metal contact points. This coating helps SEVERE GEAR 75W-85 maintain viscosity for long-lasting protection against metal-to-metal contact, even under severe-duty conditions like towing, racing, and commercial use.
How does AMSOIL SEVERE GEAR 75W-85 compare to conventional gear oils?
AMSOIL SEVERE GEAR 75W-85 outperforms conventional gear oils in several key areas. Its 100% synthetic, wax-free construction improves cold-flow properties, which enhances fuel economy and cold-weather shifting — something conventional wax-containing gear oils struggle with. It resists breakdown from high heat, preventing acid and carbon/varnish formation, while conventional oils are more prone to thermal degradation. Verified users have reported noticeable improvements in MPG and smoother shifting after switching from conventional gear oil.
Does AMSOIL SEVERE GEAR 75W-85 help reduce differential operating temperatures and improve fuel economy?
Yes. AMSOIL SEVERE GEAR 75W-85 is formulated to help reduce operating temperatures by controlling friction more effectively than conventional gear oils. Its wax-free synthetic construction improves cold-flow properties, which directly contributes to improved fuel economy and easier cold-weather shifting. Verified customers using it in 4WD differentials and rear ends on Chevy and GMC 1500 trucks have reported measurable MPG improvements after making the switch.
Is AMSOIL SEVERE GEAR 75W-85 compatible with limited-slip differentials?
Yes. AMSOIL SEVERE GEAR 75W-85 100% Synthetic Gear Lube contains friction modifiers specifically formulated for limited-slip applications. It also protects against rust and corrosion, promotes long oil, seal, and equipment life, and delivers excellent performance across hot and cold temperature extremes, making it a suitable choice for limited-slip differentials in a wide range of vehicles and equipment.
Product Details PDF - AMSOIL SEVERE GEAR® 75W-85 100% SYNTHETIC GEAR LUBE
