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Comparative
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Motor Oil
Testing
Updated Edition
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AMSOIL VS.
Castrol GTX
Chevron Supreme
Shell Formula
Valvoline SynPower
Mobil 1 Extended Performance
Motorcraft Synthetic Blend
Kendall GT-1 High Performance
Pennzoil Platinum
Quaker State Horse Power
Trop Arctic Synthetic Blend
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Motor Oils Tested
AMSOIL Synthetic
Castrol GTX
Chevron Supreme
Shell Formula
Valvoline SynPower
Mobil 1 Extended Performance
Motorcraft Synthetic Blend
Kendall GT1 High Performance
Pennzoil Platinum
Quaker State Horse Power
Trop Arctic Synthetic Blend
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Test Areas
Thin Film Oxygen Uptake (ASTM D-4742)
NOACK Volatility (ASTM D-5800)
Pour Point (ASTM D-97)
Total Base Number (ASTM D-2896)
Cold Cranking Simulator (ASTM D-5293)
Four-Ball Wear (ASTM D-4172)
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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. All six tests were completed in accordance with American Society of
Testing and Materials (ASTM) test procedures, with the results directly indicating the level of protection and
performance provided by each of the tested oils. When testing concluded, AMSOIL Synthetic Motor Oil overwhelmingly
emerged as the top-performing oil in the group. No oil outperformed AMSOIL in any of the tests. A comparison also
reveals the total cost of using AMSOIL Synthetic Motor Oil is less over 25,000 miles than all the competing motor
oils.
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EXTENDS OIL LIFE
The Thin Film Oxygen Uptake Test (TFOUT) is used to evaluate an engine oil's ability to resist heat and oxygen
breakdown when contaminated with oxidized/nitrated fuel, water and soluble metals such as lead, copper, iron, manganese
and silicon. The higher the number, the better the resistance to chemical breakdown.
AMSOIL Synthetic Motor Oil has superior heat and oxidation resistance to control sludge deposits and extend oil
life. Engines stay clean for maximum protection and oil changes are reduced, saving time and money.
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MAXIMIZES FUEL ECONOMY, REDUCES OIL CONSUMPTION AND EMISSIONS
The NOACK Volatility Test determines the evaporation loss of lubricants in high temperature service. The more motor
oils vaporize, the thicker and heavier they become, contributing to poor circulation, reduced fuel economy and
increased oil consumption, wear and emissions. The lower the number, the better the resistance to vaporization.
AMSOIL Synthetic Motor Oil resists high temperature volatilization (evaporation) better than other motor oils.
AMSOIL Synthetic Motor Oil maintains peak fuel efficiency and reduces oil consumption and emissions.
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IMPROVES COLD TEMPERATURE PERFORMANCE
The Pour Point Test determines the lowest temperature at which a lubricant will flow. The lower a lubricant's pour
point, the better protection it provides in low temperature service.
Unlike conventional oils that solidify in cold temperatures, AMSOIL Synthetic Motor Oil remains fluid down to
-54° F. AMSOIL Synthetic Motor Oil helps engines turn over easier and flows quickly to engine parts for critical
start-up protection. Engines start faster and wear is greatly reduced for extended engine life.
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CONTROLS ACID FORMATION
Total Base Number (TBN) is the measurement of a lubricant's reserve alkalinity, which aids in the control of acids
formed during the combustion process. The higher a motor oil's TBN, the more effective it is in suspending wearcausing
contaminants and reducing the corrosive effects of acids over an extended period of time.
The high TBN of AMSOIL Synthetic Motor Oil allows it to effectively combat wear-causing contaminants and acids,
providing superior protection and performance over extended drain intervals.
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HELPS ENGINES START EASIER
The Cold Crank Simulator Test determines the apparent viscosity of lubricants at low temperatures and high shear
rates. Viscosity of lubricants under these conditions is directly related to engine cranking and startability. The
lower a lubricant's cold crank viscosity, the easier an engine will turn over in cold temperatures.
The low cold crank viscosity of AMSOIL Synthetic Motor Oil reduces drag on moving engine parts and allows engines to
achieve critical cranking speed in frigid temperatures. Engines turn over quickly and dependably in the coldest winter
temperatures and motor oil flows to critical areas requiring immediate lubrication, protecting against wear at
start-up.
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PROTECTS AGAINST WEAR
The Four-Ball Wear Test evaluates the protection provided by engine oil under conditions of pressure and sliding
motion. The size of the scar left as a result of the test determines the amount of wear protection the lubricant
provides. The smaller the wear scar, the better the protection.
Tests show that no other motor oil demonstrates better anti-wear performance than AMSOIL Synthetic Motor Oil. With
AMSOIL Synthetic Motor Oil, engine life can be extended and major repairs are often reduced.
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SAVES MONEY
By extending oil drain intervals through its premium formulation, AMSOIL Synthetic Motor Oil saves drivers money. A
value comparison shows AMSOIL Synthetic Motor Oil costs less than competing motor oils over 25,000 miles.
While competing motor oils must be changed up to five times over 25,000 miles, AMSOIL Synthetic Motor Oil is only
changed once, saving both time and money.
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