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AMSOIL Performance Tests

Marine E-TEC Field Study

AMSOIL HP Marine Synthetic 2-Stroke Oil prevented piston skirt scuffing and cylinder bore scuffing in a 250-hp Evinrude E-TEC marine engine during more than 500 hours of real-world use at the engine’s lean-mix oil setting.


A Study of INTERCEPTOR® Synthetic 2-Stroke Oil for Ski-Doo Rotax E-TEC Engines 

AMSOIL subjected INTERCEPTOR® Synthetic 2-Stroke Oil to 50 hours of severe-duty engine testing and two industry-standard ASTM tests to demonstrate that INTERCEPTOR exceeds the performance requirements of high-performance DFI snowmobile engines in severe operating conditions.


3,469-Mile Case Study in Rotax E-TEC Engine

AMSOIL submitted the pistons from a Ski-Doo Rotax E-TEC 800R engine to an ASTM-calibrated rater following 3,469 miles of aggressive trail riding to reveal that AMSOIL INTERCEPTOR® Synthetic 2-Stroke Oil provided outstanding protection and prevented piston skirt scuffing and ring sticking.


AMSOIL Premium API CJ-4 5W-40 Synthetic Diesel Oil Fuel Economy

The Environmental Protection Agency (EPA) Federal Test Procedure (FTP) confirms AMSOIL Premium API CJ-4 5W-40 Synthetic Diesel Oil (DEO) improves fuel economy through virtually all driving scenarios compared to conventional 15W-40 diesel oil.


AMSOIL Premium API CJ-4 5W-40 Synthetic Diesel Oil Shear Stability

Kurt Orbahn Shear Stability testing (ASTM D-6278) reveals AMSOIL Premium API CJ-4 5W-40 Synthetic Diesel Oil (DEO) maintains outstanding shear stability, even at 4 percent fuel dilution.


AMSOIL Premium API CJ-4 5W-40 Synthetic Diesel Oil TBN and Viscosity

Compared with competing diesel oils, AMSOIL Premium API CJ-4 5W-40 Synthetic Diesel Oil (DEO) provided superior TBN and viscosity retention over 400 hours of severe-service operation in a refuse hauler fleet employing Navistar DT466 diesel engines, which are notoriously hard on motor oil.


Diesel Recovery Cold Filter Plugging Point

Cold Filter-Plugging Point (CFPP) testing shows AMSOIL Diesel Recovery (DRC) lowers the cold filter-plugging point of diesel fuel more effectively than the competing brand.


Diesel Fleet Fuel Economy Study

Testing completed in compliance with the industry-standard SAE J1321 In-Service Fuel Consumption Test Procedure demonstrates use of AMSOIL synthetic lubricants can increase fuel economy in short- to medium-haul diesel applications and, in this case, did by 6.54 percent.

AMSOIL 10W-30 Excels in API Sequence IIIF Test

The Sequence IIIF test is a stringent API SL, ILSAC GF-3 test designed to measure oil thickening and piston deposits in high temperature service, as well as provide information on valve train wear. The test is designed to emulate high-speed service under high ambient conditions.
  AMSOIL Synthetic Gear Lube Outperforms Valvoline Gear Lube

AMSOIL submitted its 75W-90 Synthetic Gear Lube (AGR) and Valvoline75W-90 Gear Lube to an independent laboratory for quality comparison tests.
  Refuse Hauler Fleet Saves $3,963.60in Oil Costs

Amsoil Synthetic 15W-40 Diesel and Marine oil delivers maximum performance, protection, and cost savings for Nordic Waste’s fleet of refuse hauler.

  AMSOIL Products Improve Efficiency and Reduce Operating Costs for Gerlach Trucking

AMSOIL INC., in conjunction with Gerlach Trucking of Erskine, Minnesota, conducted a field demonstration of its Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil, Super Duty Oil Filters and Dual-Gard filtration system equipped with BE-110 by-pass filtration elements.

  AMSOIL Synthetic Motorcycle Oils Provide Maximum Horsepower and Torque

To test the ability of AMSOIL Synthetic Motorcycle Oils to increase motorcycle horsepower and torque, AMSOIL INC. submitted AMSOIL 20W-50 Synthetic Motorcycle Oil (MCV) and NGK Iridium IX Spark Plugs to Cycle Solutions Inc., one of the top motorcycle dyno tuners in the U.S., for a pair of motorcycle dynamometer tests on late model V-Twin Harley-Davidson motorcycles.
  AMSOIL Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil Is Correct Choice For Jeff Foster Trucking

With the help of Jeff Foster Trucking Inc. of Superior, WI, AMSOIL put its Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil (HDD), as well as its Dual-Gard filtration system, to the test. 
  Truck Driver Terry Anderson Takes Big Savings to Bank

Truck driver takes big savings to the bank using AMSOIL products. Terry Anderson owns a 2005 Peterbilt dump truck and reports a savings of $5,679 in one year using AMSOIL lubes and filters.

  Wear Test Comparison - AMSOIL vs. Harley Screamin' Eagle

The recent introduction of Screamin' Eagle® Synthetic Lubricant by Harley-Davidson® indicates the Motor Company has finally recognized the benefits of running synthetic motorcycle oil in their air-cooled engines. After years of advising dealers and customers to avoid using synthetic oils in their bikes, it's natural to wonder why the company is suddenly marketing one.

A Study of SAE 5W-30 Synthetic Motor Oils

Compares the performance in laboratory tests and cost-effectiveness of AMSOIL Signature Series Synthetic Motor Oil to several passenger-car/light-truck synthetic motor oils widely considered by marketers and consumers to be the best available.



Read testimonials of customers who have used AMSOIL with great sucess. 

View More In The Performance Test Archive


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