7 Comparison Tests Run on motor oils by the API
(American Petroleum Institute)

AMSOIL Synthetic 10W-30 Motor Oil (ATM) and 10 competing conventional and synthetic10W-30 motor oils were used in the tests.

The Thin-Film Oxygen Uptake Test measures the oxidation stability of engine oils.  As the graph shows, AMSOIL Synthetic 10W-30 Motor Oil had the highest induction time of all the tested oils.  The superior oxidation stability of AMSOIL  allows it to effectively resist the formation of engine deposits and sludge, keeping engines running clean and efficient and extending oil life. It also resists thickening, maintaining its superior wear protection and lubricating properties and maximizing fuel efficiency.

The High Temperature/High Shear Test measures a lubricant's viscosity under severe operating conditions.  As the graph shows, AMSOIL had the highest induction time of all the oils tested. In fact, it didn't reach its break point in over 500 minutes of testing.

The NOACK Volatility Test measures the evaporation loss of oils in high temperature service.  The graph shows that the extremely low volatility of AMSOIL allows it to maintain its superior protective and performance qualities throughout extended drain intervals, even when faced with severe operating temperatures. In addition, oil consumption and emissions are minimized and fuel efficiency is maximized.

The Pour Point Test indicates the lowest temperature at which a fluid will flow.  The low pour point of AMSOIL allows it to maintain its fluidity in extremely low temperatures, reducing drag on moving vehicle parts, providing critical engine components with quick, essential lubrication and easing startup in cold temperatures. Wear is greatly reduced and equipment life is extended.

The Total Base Number test is the measurement of a lubricant's reserve alkalinity for combating acids.  As shown in the graph AMSOIL has the highest TBN of all the tested oils.  Which allows it to effectively combat wear-causing contaminants and acids, providing superior protection and performance over extended drain intervals.

The Cold Cranking Simulator Test  measures a lubricant's viscosity at low temperatures and high shear rates.  The low cold crank viscosity of AMSOIL reduces drag on moving engine parts and allows engines to achieve critical cranking speed in extremely frigid temperatures. Engines turn over quickly and dependably in the coldest winter temperatures.

The Four-Ball Wear Test measures a lubricant's wear protection properties. As shown in the graph, AMSOIL produced the smallest wear scar of the tested lubricants. 

The fact are clear, these tests prove that amsoil motor oil products provide unsurpassed protection against engine wear. Equipment life is extended, repairs, downtime and expenses are reduced.

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