This archive contains a historical record of AMSOIL performance tests and technical studies that are now obsolete and may not be representative of oils currently on the marketplace. The test results posted in this section reflect properties of oils available for purchase at the time of testing. The test results do not reflect properties of those oils reformulated subsequent to testing. Therefore, these publications are not available for download or distribution.
An evaluation of AMSOIL Signature Series 5W-30 Synthetic Motor Oil in standard and double-length Sequence IIIG Engine Tests.
AMSOIL Signature Series Synthetic Motor Oil delivered outstanding engine protection following more than 100,000 miles of severe service in a Las Vegas taxi, while Signature Series Synthetic Automatic Transmission Fluid virtually eliminated harmful sludge and wear in another's taxi's transmission following more than 180,000 miles.
In a dynamometer test designed to simulate conditions even more extreme than the demanding stop-and-go driving conditions of a motorcycle rally or parade route, AMSOIL 20W-50 Synthetic Motorcycle Oil demonstrated outstanding performance in temperatures more than 500°F.
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.
The industry-standard SAE J1376 Fuel Economy Measurement Test (Engineering Type) for Buses and Trucks reveals AMSOIL synthetic lubricants can increase fuel economy in class 8 diesel trucks used in stop-and-go city driving
conditions and, in this case, did by 3.15 percent.
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.
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.
Modern manual transmissions installed in heavy-duty, over-the-road (OTR) trucks pose significant challenges to lubricants. Today's manual transmission lubricants
must protect heavily loaded gears, bearings and other critical components from wear and the effects of thermal breakdown throughout extended 500,000-mile drain intervals.
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.
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.
Following more than 500,000 miles of real-world service, AMSOIL Long-Life Synthetic Transmission Oil delivered excellent protection against gear, bearing and clutch wear in over-the-road trucks.
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.
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
Released in 2012, the Maximum Shear Stability (G2752) includes the results of testing AMSOIL 5W-40 and 15W-40 100% Synthetic Premium Diesel Oils.
Released in 2009, the Refuse Hauler Fleet Field Study (G2695) includes the results of testing AMSOIL 15W-40 Synthetic Heavy Duty Diesel and Marine Motor Oil in a fleet of Nordic Waste's refuse haulers.
Introduced in July 2008, the 930,599-Mile Van brochure (G2578) features independent analysis and photos of internal engine parts from a 1999 Chevy Express delivery van that accumulated 930,599 miles using AMSOIL products.
Introduced in November 2007, A Study of Automotive Gear Lubes (G2457) compares the results of ASTM testing on 14 different gear lubricants in the most critical areas of gear oil performance.
Originally released in 2007, the Gasoline Engine Case Study With Guardian Pest Control (G2244) details the savings Guardian Pest Control experienced by switching from conventional motor oil to AMSOIL synthetic motor oil.
Updated with new test results and expanded to include 32 different motorcycle oils, A Study of Motorcycle Oils – Second Edition (G2156) describes and represents the properties of various motorcycle oils which were purchased and tested in 2008 through early 2009.
Introduced in September 2005, A Study of Motorcycle Oils (G2156) compares the results of ASTM testing on 26 different motorcycle oils in the most critical areas of motorcycle oil performance.
Introduced in September 2003, the Comparative Motor Oil Testing brochure (G1971) examines the results of ASTM testing on AMSOIL 10W-30 Synthetic Motor Oil and 10 competing conventional and synthetic motor oils. Updated in March 2009 with new test results.
Introduced in September 2003, the Comparative Motor Oil Testing brochure (G1971) examines the results of ASTM testing on AMSOIL 10W-30 Synthetic Motor Oil and 10 competing conventional and synthetic motor oils.
Introduced in June 2003, the Sequence IIIF brochure (G1916) examines the results of API Sequence IIIF testing on AMSOIL 10W-30 Synthetic Motor Oil.
Introduced in May 2003, the Gear Oil Testing brochure (G1903) compares the results of ASTM testing on AMSOIL 75W-90 Synthetic Gear Lube and Valvoline 75W-90 Gear Lube.
Introduced in March 2006, A Study of Compressor Oils (G1592) details ASTM test results comparing the performance and cost differences between 11 OEM-branded and aftermarket compressor oils.
Introduced in March 1997, the 8.2% Fuel Mileage Increase brochure (G1351) details independent laboratory testing that shows AMSOIL products provide up to 8.2 percent improved fuel efficiency in Class 8 diesel trucking applications.
Introduced in April 1997, the 409,000-Mile Oil Drain brochure (G1343) details the engine teardown of an AMSOIL-lubricated Mack E7-400 diesel engine after 409,000 miles without an oil change.
Introduced in the mid-1980s, the Fleet & Field Trials Book 2 brochure (G1068) includes results of AMSOIL synthetic gear lube and motor oil testing, as well as details on two field and fleet trials that demonstrated the benefits AMSOIL synthetic lubricants and filters provide over conventional lubricants and filters.
Introduced in the mid-1980s, the Fleet & Field Trials Book 1 brochure (G1067) includes details of four field and fleet trials that demonstrated the benefits AMSOIL synthetic lubricants and filters provide over conventional lubricants and filters.
Dating to the early days of AMSOIL, the AMSOIL Overshadows the Competition brochure (G395) includes a summary of the benefits AMSOIL synthetic lubricants and filters provided over a 16-month, one-million-mile field trial involving 44 government fleet vehicles.