Test Comparisons

Comparative Motor Oil Testing

AMSOIL Synthetic 10W-30 Motor Oil (ATM) and 10
competing conventional and synthetic10W-30 motor oils
were subjected to a series of ASTM 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 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.

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.

The High Temperature/High Shear Test

Measures a lubricant's viscosity under sever
high temperature 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.

The NOAC 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 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.

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 Synthetic
10W-30 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 (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.

The high TBN of AMSOIL Synthetic 10W-30
Motor Oil allows it to effectively combat
wear-causing contaminants and acids,
providing superior protection and
performance over extended drain intervals.

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. 10W motor oils are tested at -25°C and
must have a viscosity below 7000 cP to pass. As
shown in the graph, AMSOIL Synthetic 10W-30
Motor Oil is well below the maximum requirement,
while many of the competing oils barely pass.

The low cold crank viscosity of AMSOIL Synthetic
10W-30 Motor Oil 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 determines the wear
protection properties of a lubricant. Three metal
balls are clamped together and covered with the
test lubricant, while a rotating fourth ball is pressed
against them in sliding contact. This contact
typically produces a wear scar, which is measured
and recorded. The smaller the average wear scar,
the better the wear protection provided by the
lubricant. As shown in the graph, AMSOIL
Synthetic 10W-30 Motor Oil produced the
smallest wear scar of the tested lubricants.

AMSOIL Synthetic 10W-30 Motor Oil provides
unsurpassed protection against engine wear.
Equipment life is extended, and repairs, downtime and
expenses are reduced.

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