AMSOIL Performance Test Archive

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.

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 brand.

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.
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.