MPG Performance - How to Improve Fuel Economy, Increase Horsepower, and Save Money. For Cars, Trucks, SUVs, Pickups, Diesel Trucks, Import Cars, Sports Cars, Motorcycles, and Boats. Call 1-800-777-7094 Customer # 1282443.
 How to Order
 Import Cars
 Performance Cars
 4x4 Performance
 European Car/SUV
 Distribution Centers


 Performance Air Filter
 Fuel System Cleaners
 Best Synthetic Motor Oil
 Correct Tire Pressure
 NGK IRIDIUM Spark Plugs
 Fuel Efficient Driving
 Best Synthetic Gear Oil
 Synthetic ATF
 Manual Transmission Oil
 Auto Repair & Tune Up
 Free Ways to Save Gas


 Cummins Diesel
 Duramax Diesel
 Powerstroke Diesel
 Diesel Fuel Additive
 Donaldson Filters
 Injen Air Intake
 15W40 Diesel Motor Oil
 SAE 30 Diesel Motor Oil
 5W30 Diesel Motor Oil
 Synthetic Gear Oil
 Truck Transmission Fluid
 Allison Transmission Fluid
 PowerCore Air Filter
 By Pass Oil Flter
 Long Life Antifreeze
 Longest Truck Oil Change


 Dominator Racing Oil
 SAE 60 Racing Oil
 Injen Air Intake
 WIX Racing Filter
 EaR Racing Air Filters
 EP Severe Gear Oil
 Synthetic Grease
 IRIDIUM Spark Plugs
 Racing News


 Marine Diesel
 2 Stroke Outboard
 Marine Gear Oil
 By-Pass Oil Flter


 Motorcycle Synthetic Oil
 Harley Davidson Oil
 Motocross Racing Oil
 4 Stroke Synthetic Oil
 2 Stroke Synthetic Oil
 Snowmobile Racing Oil
 Motorcycle Oil Filter
 ATV Performance


 Compare Your Motor Oil
 Amsoil vs Mobil 1
 Synthetic Motor Oil FAQ
 Synthetic Oil Benefits
 Longer Engine Life
 25,000+ Mile Oil Change
 Cold Weather Motor Oil
 The Best Oil - AMSOIL


 Commercial Account
 Retail Sales Account
 Quick Lube Shop
 Tractor-Farm Equipment
 Business Opportunity

 The Best Synthetic Gear Oil

Synthetic Gear Oil Improves Gas Mileage and Performance
How to Improve Gas Mileage and Performance Step 7

How to Improve Gas Mileage and Increase Diesel Fuel EconomyPrevious steps:

1. Performance Air Filter
2. Clean Fuel System
3. Best Synthetic Motor Oil
4. Correct Tire Pressure
5. NGK Spark Plugs & Wires
6. Fuel Efficient Driving


Synthetic Extreme Pressure (EP) Gear Oil SAE 75W90 AND 75W140 reduce friction and increases fuel efficiency

SAE 75W-140
See prices or place an Order in the AMSOIL Online Store.
SAE 75W-90
See prices or place an Order in the AMSOIL Online Store.

Synthetic Extreme Pressure Gear Oil


  • Improves gas mileage and diesel fuel economy
  • Superior protection against friction and wear
  • Excellent for high horsepower, hauling and towing
  • Better cold weather performance
  • Lasts up to 100,000 miles

Formulated for the severe operating conditions of today's pickup trucks, SUVs, sports cars, heavy equipment and other hard working vehicles. Reduces friction and wear to improve gas mileage and diesel fuel economy. Excellent for severe applications, such as towing, hauling, steep hill driving, commercial use, racing, off-road use, rapid acceleration, frequent stop-and-go operation and high temperatures.

Cost Effective
These superior synthetic gear oils cost a few dollars more but last 2 to 3 times longer and can save you 50% on maintenance. And you can add the savings from better gas mileage on top of that. You get maximum performance, improved fuel economy and lower maintenance costs.

AMSOIL SEVERE GEAR 75W140 replaces 75W140, 80W140 and and 85W140 viscosity grades.

AMSOIL SEVERE GEAR 75W90 replaces 75W90 and 80W90.

AMSOIL SEVERE GEAR Synthetic Extreme Pressure (EP) Lubricants are premium grade lubricants specifically engineered for maximum performance and fuel economy in severe duty applications. These state-of-the-art AMSOIL formulations feature an exclusive blend of high viscosity, shear stable synthetic base oils and an extra treatment of high-performance additives. AMSOIL SEVERE GEAR Synthetic EP Lubricants maintain their 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.

Use in differentials, manual transmissions or other gear applications where one or more of the following standards are specified: API GL-5 & MT-1, MIL-PRF-2105E, Dana SHAES 234 (Formerly Eaton PS-037) for 250,000 miles, Mack GOJ, Arvin / Meritor 0-76M (75W-140), plus hypoid gear oil specifications from all domestic and foreign manufacturers such as GM, Ford and Daimler Chrysler. Can also be used in axles where API Service GL4 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.



Cars, SUVs, Light & Medium Duty Trucks

Drain at 100,000 miles of service or according to the owner's manual, whichever is longer

Drain at 50,000 miles of service or according to the owner's manual, whichever is longer

Heavy Duty Class 8 Line Haul

Follow the OEM drain interval (miles or hours) for synthetic oil up to 250,000 miles or 3 years, whichever comes first. Otherwise, drain at twice the OEM interval for conventional oil.

Heavy Duty Off-Road Vocational

Follow the OEM drain interval (miles or hours) for synthetic oil up to 120,000 miles or 1 year, whichever comes first. Otherwise, drain at twice the OEM interval for conventional oil.

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. AMSOIL SEVERE GEAR is compatible with most limited slip differentials. If limited slip differential chatter occurs, add AMSOIL Slip-Lock friction modifier additive(see below).

  • API GL5 & MT1
  • MIL-PRF-2105E
  • Dana SHAES 234 (Formerly Eaton PS-037 ) for 250,000 miles
  • Dana SHAES 256 (Formerly Eaton PS-163 ) for 500,000 miles
  • MACK GOJ & GOJ+,
  • Hypoid gear oil specifications from all foreign and domestic manufacturers
  • Can also be used in rear axles where API Service GL-4 lubricant is recommended.


Slip Lock  Differential Additive eliminates chatter
See prices or place an Order in the AMSOIL Online Store.
Slip Lock Differential Additive

In some differential applications, a friction modifier additive is necessary to reduce chatter. AMSOIL Slip-Lock Differential Additive is formulated with advanced friction modifiers and is designed to eliminate gear-housing chatter in cars, trucks and SUVs equipped with limited-slip, positraction, and locking differentials. It also reduces the banging and clunking associated with automatic locking differentials.

AMSOIL Slip-Lock Differential Additive is formulated for use with both synthetic and petroleum gear lubricants and safely replaces manufacturer recommended friction modifiers. Its convenient flip-top dispenser provides quick and easy application to the gear housing. One four-ounce bottle of Slip-Lock treats differential capacities of two to four quarts. It is not for use in automatic transmissions or other applications requiring ATF.

NOTE: AMSOIL Synthetic Gear Lubes do not require the use of this additive. However, not all differentials respond the same and if chatter is noticed, the addition of AMSOIL Slip-Lock will eliminate it. For chattering differentials not running AMSOIL Gear Lube, this product is an excellent solution to the problem.

AMSOIL Synthetic Motor Oil, Racing Oil and Diesel Oil Improve Gas Mileage and Increase Horsepower


Injen Cold Air Intake Systems Increase Horsepower, improve gas mileage and diesel fuel economy


WIX Filters are The Number One Filter in NASCAR


NGK Iridium Spark Plugs Increase Horsepower and Fuel Economy


Donaldson Heavy Duty Oil and Air Filters Increase Performance and Reduce Maintenance Costs

How to Improve Gas Mileage and Increase Diesel Fuel EconomyRemaining steps:

8. Synthetic Transmission Fluid
9. Auto Repair and Tune Up
10. Free Ways to Improve Gas Mileage

Performance That Saves You Money - MPG Performance ™  

 Home  Site Map  PDF Brochures  AMSOIL Distribution Centers  Warranty & Policies  Environment  Contact Us 

MPG Performance is dedicated to providing you with the best high performance products that improve gas mileage, increase horsepower, diesel fuel mileage, and reduce maintenance costs for all auto, truck, diesel, SUV, motorcycle, boat, and ATV applications. We have the best synthetic motor oil, heavy duty diesel oil, marine motor oil, synthetic motorcycle oil, 2 stroke and 4 stroke racing oil, transmission fluid, synthetic gear oils, NGK spark plugs & wires, and the most complete line of advanced performance air filters and oil filters, including high performance Injen AMSOIL gasoline and diesel air intake systems. We also show you the best places to get discount high performance auto parts to help you save money.

Our Maximum Fuel Economy section shows you how to get better gas mileage, improve diesel fuel economy, and increase horsepower. We have combined race proven performance products and sound fuel efficiency methods into a complete step-by-step program that includes free gas mileage tips. This fuel saving program also helps the environment. It will reduce your vehicle's exhaust emissions and pollution which can help reduce global warming.

Consult the AMSOIL Online Product Application Guide and your owners manual for service recommendations.
 Your results will vary depending on the mechanical and operating conditions of your vehicle.

 ©2011 MPG Performance™ Inc. All Rights Reserved. Certified AMSOIL Dealer. Portions of this website may be reproduced on the internet as long as credit is given and a link back to is provided on every page that uses any of our content.