AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube
Specifically Engineered for 500,000-Mile Service Life in Over-the-Road Trucks
AMSOIL 75W-90 Long Life Synthetic Gear Lube is engineered for extended drain intervals up to 500,000 miles as set by equipment manufacturers for over-the-road trucks and heavy equipment. Provides long life in passenger cars and trucks. Excellent all-season summer and winter performance. Outperforms all conventional gear oils.
Description
AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube is formulated to endure significantly longer than standard gear oils, providing superior protection under extended drain intervals. The proprietary mix of high-quality synthetic base oils combined with advanced additives combats acid, carbon buildup, and varnish caused by oxidation. This keeps gear components cleaner and enhances overall longevity. AMSOIL’s Long Life Synthetic Gear Lube also maintains viscosity stability throughout its lifespan, which supports reduced friction and wear. Its performance stays consistent in both cold and hot environments, making it reliable year-round. This gear lube is designed to extend equipment lifespan while lowering maintenance expenses.
APPLICATIONS
AMSOIL Long Life Synthetic Gear Lube is suitable for a wide range of vehicles and equipment, including domestic and imported over-the-road trucks, light to heavy trucks, off-road machinery, commercial vehicles, motor homes, SUVs, emergency response vehicles, buses, delivery vans, and tractors.
It works in differentials, manual transmissions, and other gear setups meeting standards like API GL-5 & MT-1, MIL-PRF-2105E, Dana SHAES 234 & 256 (formerly Eaton PS-037 & PS-163), Dana SHAES 429A, Mack GO-J & GO-J+, Meritor 0-76N & 0-80, as well as ZF TE-ML 07A and 08 specifications from manufacturers such as GM, Ford, and Daimler Chrysler. It also suits rear axles requiring API GL-4 lubricants.
AMSOIL’s formula stands apart from competitors like Lucas Oil and Valvoline, as it preserves viscosity and wear protection much longer under heavy-duty conditions, thanks to its shear-stable synthetic base. These qualities support significantly longer drain intervals and reduce the risk of gear damage over time.
Key benefits include:
- Strong gear and bearing load protection
- Resistance to rust and corrosion
- Smoother shifting in cold weather
- Enhanced operational efficiency
- Extended seal durability
For recommended service intervals in differentials, consult your vehicle or equipment owner’s manual or OEM guidelines, distinguishing between NORMAL and SEVERE applications.
| Normal Service | Severe Service
Cars, SUVs, Light Trucks | Replace every 100,000 miles or per manual, whichever is longer | Replace every 50,000 miles or per manual, whichever is longer
Heavy-Duty Class 8 Line Haul | Follow OEM intervals for synthetic oil up to 500,000 miles or three years, whichever occurs first
Vocational/Delivery | Follow OEM intervals up to 120,000 miles or three years, whichever occurs first
Heavy Duty Off-Road | Follow OEM intervals up to 100,000 miles or two years, whichever occurs first
For other gear uses, check manual or OEM intervals; when unavailable, replace at twice the interval of conventional oils.
Note: This product is not recommended for extended drains if water contamination is present. Frequent checks are necessary in such conditions.
Closer oil change intervals may be needed in dusty or dirty environments unless protections such as sealed gear systems and specialized breathers are used.
COMPATIBILITYAMSOIL Long Life Synthetic Gear Lube is compatible with conventional gear oils, but mixing brands limits its extended drain benefits.
It works with most limited-slip differentials; if chatter occurs, use AMSOIL Slip-Lock friction modifier.
It replaces common 75W-90 and 80W-90 gear oils from competitors.
AMSOIL PRODUCT WARRANTYAMSOIL backs this product with a Limited Liability Warranty. Details available at www.amsoil.com/warranty/.
HEALTH & SAFETY STATEMENTThis gear lube poses no health risks when used as recommended and following its Safety Data Sheet (SDS), which is accessible online or by request. Keep out of children’s reach and recycle used oil and containers responsibly.
* Trademarks belong to their respective owners without affiliation or endorsement by AMSOIL. All AMSOIL products are developed specifically for the applications shown.








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