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API
Comparative Motor Oil
Testing
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AMSOIL Synthetic 10W-30
Motor Oil (ATM) and 10 competing conventional and
synthetic10W-30 motor oils were subjected to a
series of API motor oil tests. The competing oils
included petroleum-based Castro GTX Drive Hard,
Mobil Drive Clean, Pennzoil with Purebase, Quaker
State Peak Performance and Valvoline, as well as
synthetic-based Valvoline Synpower, Quaker State,
Castrol Syntec, Pennzoil and Mobil SuperSyn
Multi-Vehicle.
Seven API tests were run on the motor oils. The
Thin-Film Oxygen Uptake Test (TFOUT) measures the
oxidation stability of engine oils. The High
Temperature/High Shear Test (HTHS) measures a
lubricant's viscosity under severe operating
conditions. The NOACK Volatility Test measures the
evaporation loss of oils in high temperature
service. Pour Point indicates the lowest temperature
at which a fluid will flow. Total Base Number (TBN)
is the measurement of a lubricant's reserve
alkalinity for combating acids. The Cold Cranking
Simulator Test (CCS) measures a lubricant's
viscosity at low temperatures and high shear rates.
The Four-Ball Wear Test measures a lubricant's wear
protection properties. The impressive test results
show AMSOIL Synthetic 10W-30 Motor Oil outperformed
the competitors in each test.
Thin-Film
Oxygen Uptake (ASTMD-4742)
The Thin-Film Oxygen Uptake Test evaluates the
oxidation stability of lubricating oils. A mixture
of the test oil and chemistries found in gasoline
engine operation (oxidized/nitrated fuel, soluble
metals and distilled water) are placed in a test
vessel, which is pressurized with oxygen and placed
in a heated bath. Anti-oxidant breakdown is evident
when the oxygen pressure in the vessel rapidly
decreases. At this point, the induction time (break
point) of the oil is recorded. As shown in the
graph, AMSOIL Synthetic 10W-30 Motor Oil had the
highest induction time of all the tested oils. In
fact, it didn't reach its break point in over 500
minutes of testing.
The superior oxidation stability of AMSOIL
Synthetic 10W-30 Motor Oil 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.
High
Temperature/High Shear (ASTM D-4683)
The High
Temperature/High Shear Test measures a lubricant's
viscosity under severe hightemperature and shear
conditions that resemble highly-loaded journal
bearings in fired internal combustion engines. In
order to prevent bearing wear, it is important for a
lubricant to maintain its protective viscosity under
severe operating conditions. The minimum High
Temperature/High Shear viscosity for a 30 weight oil
is 2.9 cP. As shown in the graph, AMSOIL Synthetic
10W-30 Motor Oil surpasses this minimum standard and
displayed the highest High Temperature/High Shear
viscosity in the group.
The superior viscosity retention of AMSOIL
Synthetic 10W-30 Motor Oil in the face of severe
temperature and shear conditions allows it to
provide continuous, unsurpassed protection for
engine bearings, extending equipment life and
preventing wear.
NOACK
Volatility (ASTM D-5800)
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. A maximum of 15
percent evaporation loss is allowable to meet API SL
and ILSAC GF-3 specifications. As shown in the
graph, AMSOIL 10W-30 Synthetic Motor Oil
outperformed its nearest competitor by over 30
percent.
The extremely low volatility of AMSOIL Synthetic
10W-30 Motor Oil 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.
Pour
Point (ASTM D-97)
The Pour Point Test determines the lowest
temperature at which a lubricant will flow when
cooled under prescribed conditions. The lower a
lubricant's pour point, the better protection it
provides in low temperature service. As shown in the
graph, AMSOIL Synthetic 10W-30 Motor Oil has the
lowest pour point of the tested oils.
The low pour point of AMSOIL 10W-30 Synthetic
Motor Oil 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.
Total
Base Number (ASTM D-2896)
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 wear-causing
contaminants and reducing the corrosive effects of
acids over an extended period of time. As shown in
the graph, AMSOIL Synthetic 10W-30 Motor Oil has the
highest TBN of the tested oils.
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synthetic motor oil in 1972. By specializing exclusively in the
synthetic lubricant technology, AMSOIL is able to optimize the
most advanced chemistries available. The "Genuine Synthetic
PAO Formulated" designation displayed on AMSOIL packaging
indicates that the oils are formulated with Polyalphaolefin (PAO)
synthetic base stocks. This chemistry is the industry's premier
base stock technology. Unlike conventional mineral-based
chemistries, AMSOIL PAO base stocks contain fullysaturated,
hydrogenated molecules and are free of wax and other impurities.
Combined with an exact balance of premium additives, itdelivers
superior hot and cold temperature performance, resists oxidation
and acid formation and provides long-term wear protection.
AMSOIL "General Synthetic PAO Formulated" oils have
shattered the parameters of the most rigorous industry testing
and set the standard for all other motor oils.