Lubrication for anything that has teeth
SAE 75w90 Synthetic Gear Oils that keeps you in service for longer
You put your equipment through the most unexpected conditions. Temperatures can fluctuate 40C from one day to the next while simultaneously changing between wet and dry. When “ridden hard and put away wet” is part of your vocabulary, it stands to reason that your equipment could be a case study for stress testing. Will your gears hold up?
Prevent damage that can result from gear oils that can’t withstand the pressure. Instead of using the OEM or bare-minimum standard for gear lube, choose AMSOIL severe gear 75W-90 oils that are specially formulated to thrive in extreme pressure, hot and cold weather, moist conditions, and all while extending the service life.
Gear oils that stand up to extreme working conditions
- Excels in hot and cold temperature extremes.
- Resists breakdown from high heat, preventing acids, carbon and varnish formation.
- Wax-free construction also improves cold-flow properties, improving fuel economy and cold-weather shifting.
- Delivers 20 percent more cold-temperature protection than required by the industry standard.
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SAE 75W-90 Gear Oil products available
Gear lubricant products are packaged in convenient sizes, so you aren’t left with partially full containers. Also, the AMSOIL Easy Pack design fits into tight spaces where 1L bottles cannot, eliminating the need for a transfer pump.
- AMSOIL SEVERE GEAR is available in common viscosities like 75W-90, 75W-110, 75W-140 and 80W-90 and are perfect for long-lasting differential services.
- 75W-90 Long Life Synthetic Gear Lube is specially formulated for the needs of long-haul trucking with intervals as long as 805,000 km.
- AMSOIL Synthetic Marine Gear Lube 75W-90 has superior foam protection and is a barrier against damage from moisture for gearbox oil in your marine applications.
Severe Gear®
75W90
(SVG)
Severe Gear®
75W-110
(SVT)
Severe Gear®
75W-140
(SVO)
Severe Gear®
80W-90
(AGL)
Severe Gear®
SAE 250
(SRT)
Customer Review:
“First time user of AMSOIL. What a difference it makes. Did differential service on my 4wd vehicles, they roll allot easier. Have already ordered my engine oil and filter for next oil change.”
Long Life
75W-90
(FGR)
Long Life
80W-140
(FGO)
Slip Lock
(ADA)
V Twin Primary
(MVP)
Chaincase &
Gear Oil
(TCCCN)
Marine Gear
75W-90
(AGM)
Gear Oil Reviews
| Problem | User Feedback | Result |
|---|---|---|
| Noisy shifting / gear clunks | Improved shifting, quieted operation | Noticeably smoother rides |
| Differential wear | Bearings preserved, fluid longevity | Saved costly repairs |
| Time & mess in fluid changes | Easy-Pack, squeeze pouches | Faster, cleaner maintenance |
| Heavy loads & towing | No leaks or performance issues | Reliable for heavy-duty use |
| Budget constraints | Lower cost than OEM | Better value without compromise |
| Early metal debris | Minimal wear particles found | Still trusted for protection |
What We Do
We help drivers and gearheads protect their investments with premium drivetrain fluids like AMSOIL Severe Gear® 75W-90 Synthetic Gear Lube.
Designed for extreme temperatures, high torque, and heavy-duty use, this product provides advanced wear protection and thermal stability for manual transmissions, rear differentials, and gearboxes in everything from light trucks to drag racers.
The Issue
Vehicle owners across North America reported the same challenges:
- Harsh shifting and gear clunking in Harley transmissions and trucks
- Noisy rear diffs and chatter in limited slip differentials
- Premature wear under high-speed, high-load, and off-road conditions
- Messy fluid changes using old-school bottles and pumps
- Poor cold weather performance and sluggish oil flow in cold climates
Drivers needed a high-performance synthetic gear oil that could handle tough operating conditions, offer low temperature fluidity, and deliver long-lasting protection without frequent changes.
What We Did
We introduced these users to AMSOIL Severe Gear® 75W-90, featuring:
- A fully synthetic formula for high-load, high-speed, and shock-loading environments
- Extreme pressure additives and performance additives for maximum durability
- Safe compatibility with yellow metals and limited slip differentials
- Convenient Easy-Pack pouch design for quick, clean installation
- Support for GL-5 requirements and proven protection for hypoid gear oil applications
Highlight
Here’s how AMSOIL Severe Gear made an impact:
- Smoother gear changes – Harley riders and truck owners reported major improvements in shifting, with less gear noise and smoother clutch engagement
- Reduced differential noise – Chatter in aging diffs virtually disappeared with the addition of AMSOIL Slip Lock and Severe Gear
- Clean, easy fluid changes – The Easy-Pack pouch made drain and refill jobs 2x faster without messy pumps
- Held up under pressure – Users towing RVs, racing in Jeep Trackhawks, and off-roading in rugged terrain all praised the oil’s high-temperature and shock-loading protection
- Affordable vs OEM brands – Many reported switching from dealer brands to AMSOIL, saving up to 50% without compromising on quality
Results
Thousands of real-world reviews confirm that AMSOIL Severe Gear 75W-90 does what conventional gear oil can’t:
- Cuts down gearbox noise and improves drivetrain response
- Delivers reliable performance in extreme cold and high-heat conditions
- Keeps differentials clean and reduces wear particles
- Makes gear lube changes faster and cleaner for DIYers and pros alike
Amsoil Severe Gear isn’t just a synthetic gear oil—it’s a full drivetrain solution that protects your ride, saves you money, and keeps you running smoothly, no matter the conditions.