AMSOIL Severe Gear Synthetic
Gear Lubes Provide Superior Protection Against Thermal Runaway
The Hotter
It Gets The Hotter It Gets
Modern turbo diesel
pickup trucks, V-10 gasoline pickups and sport utility vehicles
(SUVs) and high-horsepower V-8 trucks boast more towing and
payload capacities than ever before. In fact, the market has
seen a 34 percent increase in engine horsepower over the last
decade. In the light truck segment, there has been a 93 percent
horsepower increase since 1981. In vehicles such as a fifth-wheel
equipped Ford F-350 Super Duty, towing capacities have reached
a high of 19,200 lbs. Testing shows that in new axle applications
simulating trailer towing at 88 km/h (55 mph) at a 3.5 percent
grade, temperatures can reach as high as 188 degrees C (370
degrees F). Differential stress has also increased in limousines,
conversion vans, and trucks and cars with modified, high-performance
engines.
The
extreme loads, pressures and temperatures experienced by modern
vehicles place increased stress on gear lubricants that can
lead to a serious condition known as thermal runaway. As temperatures
in the differential climb upward, gear lubricants tend to
lose viscosity, while extreme loads and pressures can break
the lubricant film, causing increased metal-to-metal contact
and heat. The increased friction and heat, in turn, cause
the lubricant to lose further viscosity, which further increases
friction and heat. As friction and heat increases, lubricant
viscosity decreases. As viscosity decreases, friction and
heat continue to spiral upward. The hotter it gets, the hotter
it gets. It's a vicious cycle that eventually leads to greatly
increased wear and irreparable equipment damage.
AMSOIL Severe Gear
Synthetic Extreme Pressure (EP) Gear Lubes feature an exclusive
blend of high viscosity, shear stable synthetic base oils
and an extra treatment of high-performance additives that
provide a highly protective iron sulfide barrier coating on
gear surfaces. Severe Gear Synthetic Gear Lubes effectively
protect equipment from thermal runaway through superior viscosity
protection.
Viscosity
Protection
Viscosity is the
most important property of a lubricant in its defense against
friction and wear. Viscosity correlates to film strength,
and it is film strength that keeps moving parts from contacting
each other and creating friction, heat and wear. The higher
the viscosity of a lubricant, the greater protection it provides.
AMSOIL
Severe Gear Synthetic Gear Lubes are available in 75W-90,
75W-110,
75W-140,
SAE
190 and SAE
250 viscosities, each providing superior protection through
superior film strength.
Viscosity
Index
As temperatures
rise, gear lubricant viscosity and load carrying abilities
decrease. A lubricant's viscosity index (VI) indicates its
ability to maintain its protective viscosity in high temperature
service. The higher a lubricant's VI, the less its viscosity
changes in temperature extremes.
The ASTM D-2270
Viscosity Index Test measures a lubricant's viscosity change
between 40 degrees C (104 degrees F) and 100 degrees C (212
degrees F). AMSOIL Severe Gear Synthetic 75W-90 Gear Lube
provides a high viscosity index , allowing it to protect against
thermal runaway by maintaining its superior viscosity protection
in high temperature service.
Shear Stability
Many gear lubes
are formulated with viscosity index (VI) improvers in order
to ensure multi-grade viscosity protection in both hot and
cold temperatures. VI improver additives keep lubricants from
becoming too thick to flow in cold temperatures and too thin
to protect in high temperatures. However, shearing forces
within equipment can cause these additives to break down and
lose viscosity.
The CEC L-45-A-99
(KRL) 20-Hour Shear Test is a requirement for all automotive
gear lubes to ensure they do not shear down and fall below
minimum viscosity requirements. The graph shows initial oil
viscosity and viscosity following the test, while the shaded
area indicates SAE J306 high-temperature viscosity requirements
for SAE 90 gear lubes.
As seen in the
graphs, two gear oils (Lucas 75/90 Synthetic and Royal Purple
Max-Gear 75W-90) failed SAE J306 requirements before the shear
test began, exceeding the maximum 18.49 cSt initial viscosity
requirements for SAE J306. Viscosity measurements following
the test revealed that seven gear lubes (Pennzoil Synthetic
75W-90, Mobil 1 Synthetic 75W-90, Pennzoil Gearplus 80W-90,
Mopar Synthetic 75W-90 with Mopar LS additive, GM Synthetic
Axel 75W-90, Royal Purple Max-Gear 75W-90, Torco SGO Synthetic
75W-90 with Torco Type G LS additive) sheared down below the
minimum viscosity requirements for SAE J306. AMSOIL Severe
Gear 75W-90 tested in the proper initial viscosity range and
retained the highest viscosity of all tested tested oils after
the shear test, indicating its superior ability to protect
against thermal runaway by maintaining its protection qualities
in severe, high shear operating conditions.
The superior viscosity
protection, viscosity index and shear stability properties
of AMSOIL
Severe Gear Synthetic Gear Lubes effectively protect equipment
from the devastating effects of thermal runaway. Severe Gear
Synthetic 75W-90, 75W-110 and 75W-140 Gear Lubes are ideal
for severe-duty applications, including towing hauling, steep
hill driving, commercial use, plowing, racing, off-road use,
rapid acceleration, frequent stop-and-go operation and high
ambient temperatures.
AMSOIL
Severe Gear 75W-90 provides superior performance and replaces
competing 75W-90 and 80W-90 gear oils. It delivers the best
fuel efficiency and cold temperature performance in the Severe
Gear line.
AMSOIL
Severe Gear 75W-110 provides superior performance and
replaces competing 75W-110, 75W-90 and 80W-90 gear oils. It
delivers better viscosity protection than Severe Gear 75W-90
and better fuel efficiency than Severe Gear 75W-140.
AMSOIL
Severe Gear 75W-140 provides superior performance and
replaces competing 75W-140, 80W-140 and 85W-140 gear oils.
It is recommended where these viscosities are required by
OEMs and where maximum viscosity protection is needed for
extreme severe-duty applications.
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Premium AMSOIL
Synthetic Motor Oils offer the longest drain intervals
on the market, unsurpassed protection and performance that
effectively extends equipment life and improved fuel economy,
saving customers money at the pump and reducing the nation's
dependence on foreign oil.
"AMSOIL
INC. warrants that the use of its lubricants will not cause
mechanical damage to any mechanically sound equipment when
AMSOIL INC. products are used in full compliance with the
company's recommendations and instructions."
AMSOIL
synthetic motor oils are formulated to surpass engine test
specifications, offering protection far greater than competing
motor oils for extended drain intervals. Most synthetic oil
manufacturers make no claim to extended drain intervals, deferring
to the maintenance schedule provided by the vehicle manufacturer.
With its unparalleled oil and warranty program, AMSOIL offers
consumers unprecedented protection and economics.
Another
AMSOIL First
More than 20 years
ago, AMSOIL began using the NOACK volatility test as a comparison
tool and measurement of quality. Back then, nearly every oil
tested side-by-side with AMSOIL synthetic motor oils failed,
and those that passed barely squeaked by. Other oil companies
paid no attention to NOACK results until Ford Motor Company
made it a requirement for service fill oils, validating what
AMSOIL had said all along.
THE
NOACK Volatility Test
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. AMSOIL
Synthetic Motor Oil resists high temperature volatization
better than other motor oils. AMSOIL Synthetic Motor
Oil maintains peak fuel efficiency and reduces oil consumption
and emissions.
AMSOIL Now An ISO Certified
Manufacturer
AMSOIL recently
received ISO 9001:2000 certification of our Quality Management
System (QMS). NSF International Strategic Registrations is
the registrar that has verified our QMS meets the requirements
of the ISO 9001:2000 standard, the most widely utilized quality
standard throughout the world for quality management systems.
ISO standards are used by over 300,000 companies worldwide
setting rigorous standards for businesses, government and
industry.
ISO 9001:2000
is applicable to any manufacturing and service organization
providing a framework for system development that focuses
on the customer, quality system performance and ongoing improvement.
AMSOIL received ISO 9001:2000 registration under the scope:
synthetic lubricants blending, packaging, and other fulfillment
directly associated with lubricant product.
The ISO
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companies in the world. It is further assurance that the products
and services AMSOIL provides will continue to maintain the
high level of quality the company always demanded.
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The
extreme loads, pressures and temperatures experienced by modern
vehicles place increased stress on gear lubricants that can
lead to a serious condition known as thermal runaway. As temperatures
in the differential climb upward, gear lubricants tend to
lose viscosity, while extreme loads and pressures can break
the lubricant film, causing increased metal-to-metal contact
and heat. The increased friction and heat, in turn, cause
the lubricant to lose further viscosity, which further increases
friction and heat. As friction and heat increases, lubricant
viscosity decreases. As viscosity decreases, friction and
heat continue to spiral upward. The hotter it gets, the hotter
it gets. It's a vicious cycle that eventually leads to greatly
increased wear and irreparable equipment damage.