Severe Gear® 75W-140 Some Differentials need a heavier viscosity. Use the one that can both protect AND keep temps down!
The requirement for a 140 in differentials isn’t too common nowadays but where it is needed you can’t afford to not use Severe Gear. The AMSOIL SVO (75W-90 GL5 Hypoid Gear Oil) will keep temperatures down significantly under loads which allows more speed and power to the wheels. You can measure it with a temp gauge or laser thermometer.
AMSOIL Severe Gear® 75W-140 Synthetic Extreme Pressure (EP) Gear Lube is a premium-grade gear oil specifically engineered for maximum performance in severe-duty applications. This state-of-the-art AMSOIL formulation features an exclusive blend of high-viscosity, shear-stable synthetic base oils and an extra treatment of high-performance additives. AMSOIL Severe Gear Synthetic EP Gear Lube maintains its viscosity for long-lasting protection against metal-to-metal contact. The proprietary AMSOIL additives form an iron-sulfide barrier coating on gear surfaces, providing the ultimate line of defense against wear, pitting and scoring. AMSOIL Severe Gear helps prevent “thermal runaway” — a phenomenon caused by a lubricant’s inability to control friction and increased heat under high-stress conditions. By controlling thermal runaway, AMSOIL Severe Gear Synthetic EP Gear Lube inhibits rapid lubricant degradation and component damage. Equipment runs better and lasts longer with AMSOIL Severe Gear Synthetic EP Gear Lube.
“The notable performance in Ford differentials requiring 75W-140 is due to AMSOIL’s engineers developing breakthrough technology within advanced synthetic chemistries.”
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AMSOIL’s Severe Gear 75W-140 provides performance beyond that possible with conventional gear oil. It’s one of the best products AMSOIL Makes in fact! This AMSOIL custom product offers superior gear and bearing protection, better friction and heat reduction, increased efficiency and extended service life.
AMSOIL Severe Gear Synthetic 75W-140 EP Gear Lube is excellent for severe applications, such as towing, hauling, steep-hill driving, commercial use, plowing, racing, off-road use, rapid acceleration, frequent stop-and-go operation and high ambient temperatures. Higher horsepower, towing and hauling capabilities of modern vehicles make turbo-diesel pick-ups, SUVs, vans and delivery/utility vehicles especially prone to severe service. Other severe-duty vehicles include light, medium and heavy-duty trucks, buses, heavy equipment, 4X4s, tow trucks, race cars, tractors and motor homes.
Recommended for use in differentials, manual transmissions and other gear applications requiring any of the following specifications: API GL-5, MT-1, MIL-PRF-2105E, Dana SHAES 234 (Formerly Eaton PS-037), Mack GO-J, or other GL-5 based specifications from manufacturers such as GM, Ford and Chrysler. Can also be used in axles where an API GL-4 lubricant is recommended.
For product service life in differentials, consult your owner’s manual or the Original Equipment Manufacturer (OEM) to establish the application, NORMAL or SEVERE.
For product service life in non-differential applications, consult owner’s manual or the OEM for either normal or severe synthetic oil service intervals. Where service intervals are unavailable, drain at twice the interval for conventional oil.
Gear oils should be changed more frequently when operating vehicles or equipment in dusty or dirty conditions, unless the gear system is properly sealed and equipped with membrane-type breathers.
Note: AMSOIL does not support extended drain intervals where water contamination occurs. Check and service the gear oil frequently when water contamination is possible.
Also it’s not recommended to use a 75W-140 where a 90WT (75/80W-90) is recommended unless you are using it to make up for severe wear.
AMSOIL Severe Gear (75W-140) provides superior performance and replaces competitors’ 75W-140, 80W-140 and 85W-140 gear oils. Use where these viscosities are required by OEMs and where maximum viscosity protection is needed for extreme severe-duty applications.
AMSOIL Severe Gear is compatible with conventional and synthetic gear oils. Mixing AMSOIL gear oil with other oils, however, will shorten the oil life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.
Aftermarket oil additives, other than those specified by AMSOIL, are not recommended for use with AMSOIL gear oil.
AMSOIL Severe Gear is compatible with most limited-slip differentials. If limited-slip differential chatter occurs, add AMSOIL Slip Lock® friction modifier additive.
Buy & PricingFord specified the creation of 75W-110 for the purpose of allowing a slightly lighter viscosity for better fuel economy and lower temperatures in trucks, SUV’s and cars. And I use it in vintage cars using or adapting a Ford 9″ or other diff. Less drag equals more performance. I see a lot of people using 75W-90 in these too but on the side of caution the AMSOIL 75W-110 SVT was designed for this purpose!!
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