AMSOIL Severe Gear Provides
Unsurpassed Shear Stability
AMSOIL
Severe Gear Synthetic Gear Lube
Originally Model-year
2007 turbo diesel pickup trucks, V-10 gasoline pickups and
sport utility vehicles (SUVs), and high-horsepower V-8 trucks
have more towing and payload capacities than in previous years,
yet their differentials have not changed. There has been been
a 34 percent increase in engine horsepower over the last decade,
while axle gear sizes have remained constant, sump capacities
have been lowered and drain intervals extended. 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. And 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). Stress on differentials has also increased in
limousines, conversion vans, and trucks and cars with modified,
high-performance engines. More power, more towing capacity
and higher hauling limits greatly increase the stress that
causes heat and wear.
Most vehicles operate
under severe service as defined by vehicle manufacturers,
but the majority of vehicle owners are unaware of this. Severe
service applications include towing, hauling, plowing, off-road
use, frequent stop-and-go driving, steep-hill driving and
temperature extremes. Severe service applications are on the
rise. For example, more than 90 percent of Ford Super Duty
pickups are used for towing. Severe service increases the
need for better gear lubrication.
AMSOIL
Severe Gear Synthetic Gear Lubes provide superior performance
and protection. Their well-balanced synthetic formulation
reduces friction and wear and improves efficiency. In fact,
AMSOIL recently completed a white paper entitled A Study of
Automotive Gear Lubricants that proves AMSOIL Severe Gear
Synthetic 75W-90 Gear Lube's superiority. This issue of Service
Line examines the results of one of the tests from the white
paper, the KRL 20-Hour Shear Stability Test.
KRL Shear
Stability Test
Similar to 5W-30
automotive engine oils, 75W-90
gear lubricants are defined as multi-viscosity. This means
the gear lubricant has enough viscosity to protect against
wear at high temperatures, as well as good flow properties
at cold temperatures. Many gear lubes cannot fulfill both
requirements without the use of VI improver additives. VI
additives keep lubricants from becoming too thick to flow
in cold temperatures and too thin to protect in high temperatures.
VI additives have many uses. If used improperly in gear lubricants,
however, they can break down and lose viscosity through a
process called shearing. Because of this, the SAE incorporated
the CEC L-45-A-99 (KRL) 20-Hour Shear Test as a requirement
for all automotive gear lubes. This specification requires
that gear lubes not shear down and fall below the minimum
viscosity for that grade. Testing showed that Lucas 75/90
Synthetic, at 22.35 centistrokes (cSt), and Royal Purple Max-Gear
75W-90, at 19.32 cSt, both exceed the maximum 18.49 cSt initial
viscosity, failing the SAE J306 requirements for SAE 90 gear
lubes. All other gear lubricants were within the required
high-temperature viscosity range prior to the KRL Shear Stability
Test.
Viscosity measurements
following the KRL test revealed that seven gear lubes sheared
down below minimum viscosity requirements, failing the shear
stability requirements of the SAE J306. The two gear lubes
with the largest viscosity loss, were Royal Purple, losing
40.6 percent of its viscosity, and Torco SGO Synthetic, losing
35.2 percent of its viscosity. Royal Purple was the only gear
lube to fail both the initial viscosity requirements and the
shear stability requirements. It started out too thick and
ended up too thin. Torco SGO Synthetic finished the shear
stability test as the thinnest of all the oils at 9.97 cSt,
far below the minimum 13.5 cSt requirement. Lucas 75/90 Synthetic,
with an initial viscosity that exceeded the maximum requirements
by 20.8 percent, passed the shear stability test, but lost
34.5 percent of its viscosity, the third largest loss of viscosity.
Both OEM gear lubes, GM and Mopar, failed the minimum viscosity
requirements after the shear test. Of all the gear lubes tested,
half did not meet the SAE J306 shear stability requirements.
AMSOIL
Severe Gear 75W-90 was in the proper initial viscosity
range and retained the highest viscosity after the shear test
with a viscosity of 16.03 cSt - the mid-point of the SAE 90
viscosity grade.
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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
certification puts AMSOIL in line with some of the most efficient
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.
AMSOIL Product Information
Use This
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on AMSOIL Products.
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weekly newsletter by email - please complete this form.
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