Compare Engine Oils
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Compare Automotive Oils
AMSOIL Synthetic 10W-30 Motor Oil (ATM) and 10 competing conventional, synthetic and synthetic blend 10W-30 motor oils were subjected to a series of motor oil tests by an independent laboratory using ASTM methods.

AMSOIL  10W-30 Synthetic Motor OilThe competing oils tested included:
  • AMSOIL ATM
  • Mobil 1 Extended Performance
  • Quaker State Advanced Full Synthetic
  • Pennzoil Platinum
  • Trop Artic
  • Motorcraft
  • Castrol GTX
  • Chevron Supreme
  • Havoline
  • Formula Shell
  • Pennzoil
Seven tests were run on the motor oils:
  • Thin Film Oxygen Uptake (ASTM D4742) measures the oxidation stability of engine oils.
  • High Temperature/High Shear (ASTM D4683) measures a lubricant's viscosity under severe operating conditions.
  • NOACK Volatility (ASTM D5800) measures the evaporation loss of oils in high temperature service.
  • Pour Point (ASTM D97) indicates the lowest temperature at which a fluid will flow.
  • Total Base Number (ASTM D2896) is the measurement of a lubricant's reserve alkalinity for combating acids.
  • Cold Cranking Simulator (ASTM D5293) indicates the degree to which a lubricant can impact cold weather starting.
  • Four-Ball Wear (ASTM D4172) measures wear preventive characteristics of lubricating fluid
The impressive test results show AMSOIL Synthetic 10W-30 Motor Oil outperformed the competitors in nearly every test.

Read the Comparative Motor Oil Test Report
AMSOIL 0-30W Premium Synthetic "Signature Series" Motor Oil (35,000 Miles)
Recently AMSOIL introduced the longest "drain interval" synthetic motor oil on the market today. Those claims were made after extensive independent and "in house" laboratory testing.

AMSOIL 0W-30 (SSO) 100% Synthetic Motor Oil used with AMSOIL "Ea" Oil filters can extend engine oil drain intervals to 35,000 miles for many vehicles.
Compare Motorcycle Oils
Motorcycle engines typically run at higher RPMs and compression ratios than automobiles. Motorcycle engine oils also have to perform throughout a wider variance of operating temperatures. It is apparent that motorcycle applications place a different set of requirements on lubricating oils. Motorcycle oils, therefore, must be formulated to address this unique set of high stress conditions.
Motorcycle Oil Comparative Testing
AMSOIL  10W-40 Synthetic Motorcycle OilThe testing used to evaluate the lubricants was done in accordance with American Society for Testing and Materials (ASTM) procedures. Test methodology has been indicated for all data points, allowing for duplication and verification by any analytical laboratory capable of conducting the ASTM tests.

Motorcycle Oils Compared in the Test (SAE 40 Group)
  • AMSOIL MCF
  • Bel-Ray EXS
  • Castrol GPS
  • Golden Spectro 4
  • Lucas High Performance Motorcycle
  • Maxima Maxum 4
  • Mobil 1 MX4T
  • Motul 300V Sport
  • Pennzoil Motorcycle
  • Royal Purple Max-Cycle
  • Torco T-4SR
  • Valvoline 4-Stroke
AMSOIL  20W-50 Synthetic Motorcycle OilMotorcycle Oils Compared in the Test (SAE 50 Group)
  • AMSOIL MCV
  • Bel-Ray EXS
  • BMW
  • Castrol GPS
  • Castrol V-Twin
  • Golden Spectro 4
  • Golden Spectro American 4
  • Lucas High Performance Motorcycle
  • Mobil 1 V-Twin
  • Motul 300V Competition
  • Pennzoil Motorcycle
  • Royal Purple Max-Cycle
  • Screamin Eagle Syn3
  • Torco T-4SR
  • Valvoline 4-Stroke
  • Yamalube 4-R
The motorcycle oils tested were evaluated for:
  • An oil's ability to meet the required viscosity grade of an application.
  • An oil's ability to maintain a constant viscosity when exposed to changes in temperature.
  • An oil's ability to retain its viscosity during use.
  • An oil's ability to resist shearing forces and maintain its viscosity at elevated temperatures.
  • An oil's zinc content.
  • An oil's ability to minimize general wear.
  • An oil's ability to minimize gear wear.
  • An oil's ability to minimize deterioration when exposed to elevated temperatures.
  • An oil's ability to resist volatilization when exposed to elevated temperatures.
  • An oil's ability to maintain engine cleanliness and control acid corrosion.
  • An oil's ability to resist foaming.
  • An oil's ability to control rust corrosion.
The purpose of this extensive testing on motorcycle oils is to provide information regarding motorcycle applications, their lubrication needs and typical lubricants available to the end user. It is intended to assist the end user in making an educated decision as to the lubricant most suitable for his or her motorcycle application.

You can read the full report in this white paper; "A Study of Motorcycle Oils", published by the AMSOIL PowerSports Group.
Compare Automotive Gear Lubes
AMSOIL  10W-30 Synthetic Motor OilIn September 2007, the AMSOIL Drivetrain Division published comprehensive test data after testing multiple competitive Gear Lubricants on the market today.

The requirements for automotive gear lubrication have substantially changed, while vehicle owner awareness lags behind. The differentials that house the gears are out of sight, out of mind, often neglected. But differentials are just as important to the operation of a vehicle as the engine. Gear lubrication needs to be taken more seriously than before.

Modern vehicle aerodynamic design is decreasing air flow over differentials, increasing operating temperatures. Engine performance and horsepower is on the rise along with towing and cargo capacities. We are working our vehicles harder than ever, causing what might seem like everyday operation to conceal extreme service conditions.

2007 turbo diesel pickup trucks, V-10 gasoline pickups and sport utility vehicles (SUVs), and high-horsepower V-8 trucks have more towing and payload capacities than in previous years, yet their differentials have not changed much.
Automotive Gear Lubricant Testing Methods
The testing by which the gear lubes were evaluated was done in accordance with American Society for Testing and Materials (ASTM) procedures, Society of Automotive Engineers (SAE) J306 requirements and Federal Test Method Standards. Other than the oxidation filter patch procedure, performance testing was conducted by an independent laboratory. Physical-property testing (viscosity, viscosity index, pour point and foaming after oxidation) was conducted in-house.
Automotive Gear Lubricant Test Subjects
  • AMSOIL® Severe Gear® 75W-90
  • Castrol® SYNTEC® 75W-90
  • GM® Synthetic Axle 75W-90
  • Lucas® 75/90 Synthetic
  • Mobil 1® Synthetic 75W-90
  • Mopar® Synthetic 75W-90 with Mopar® LS additive
  • Pennzoil® Synthetic 75W-90
  • Red Line® Synthetic 75W-90
  • Royal Purple® Max-Gear® 75W-90
  • Torco® SGO Synthetic 75W-90 with Torco® Type G LS additive
  • Valvoline® SynPower® 75W-90
  • Castrol® Hypoy C 80W-90 (Petroleum Based)
  • Pennzoil® Gearplus® 80W-90 (Petroleum Based)
  • Valvoline® High Performance 80W-90 (Petroleum Based)
Gear Lube Performance Testing
The performance characteristics evaluated include each gear lube's ability to:
  • Meet the required viscosity grade of an application
  • Maintain viscosity when subjected to temperature changes
  • Retain viscosity during use
  • Function in cold temperatures
  • Resist high temperatures and oxidation
  • Protect under extreme pressures
  • Protect against wear
  • Resist foaming
  • Prevent copper corrosion
The purpose of these Gear Lube Tests and comparisons is to inform end users about the increasingly severe conditions under which differentials operate and to provide data reflecting the quality and cost differences of popular synthetic and petroleum gear lubes. With this information, consumers are better prepared to make informed decisions when purchasing gear lubricants.

You can read the full report; "A Study of Automotive Gear Lubes" , published by the AMSOIL Drivetrain Division in September 2007 here.
AMSOIL - A Clear Leader in Comparison Testing
Independent Laboratory Testing of motor oils and lubricants per multiple industry (civilian) and military standards is an extremely time consuming and expensive process, but it remains an integral characteristic of AMSOIL's corporate culture.

AMSOIL has always been dedicated to providing the very best in synthetic oils, greases and lubricants. AMSOIL is very careful when testing formulations against competitors, using only acceptable and repeatable standards and methodology so that published reports are factual and repeatable by any qualified lab.

AMSOIL scientifically tests product formulations both in the lab and on the track. Don't miss out on our Racing Info and News.
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