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Motor
Oil Test & Comparison - The Most Comprehensive Test Results
Ever Published by AMSOIL
Change Gear Lube After Break-In
Period for Long Differential Life
Unbeknownst to many
motorists, most differntial wear occurs during the break-in
period. AMSOIL encourages motorists to change their gear lube
following the break-in period in order to reduce wear and
extend differential life.
Motorists know when they're
supposed to change their motor oil. They have oil life monitors,
oil change centers and commercials all telling them when it's
time for an oil change. Differential oil changes, on the other
hand, often get overlooked. Many people don't even think of
the differential when performing routine maintenance on their
vehicles and don't realize four-wheen drive trucks have two
differentials and a transfer case that all require service.
In fact, according to one quick lube company, only one to
two percent of their customers purchase a differential gear
lube change.
Most differential wear occurs
during the break-in period. Beacause differentials are not
equipped with filters, break-in metals are suspended in the
oil, causing increased wear as the particles mesh between
the gears. Hauling heavy loads and towing heavy trailers cause
additional stress to the differential during the break-in
period and can cause premature differential damage or failure.
Changing the gear lube after the break-in period (about 3,000
miles) is a low-cost maintenance investment that provides
a significant payoff, including greatly reduced wear, extended
differential gear and bearing life and protection for expensive
vehicle investments. Auto manufacturers recognize the importance
of draining abrasive break-in materials. Some manufacturers
recommend an initial drain interval of between 500 and 3,000
miles.
Differential internal components
consist of six gears (one pinion, one ring, two side and two
spider gears), six bearings (two pinion, two carrier and two
axle) and sometimes include a clutch setup for limited slip
performance. All of these parts require high quality, clean
gear oil in order to perform at an optimal level.
Most pickup trucks, SUVs and
vans operate in severe service conditions, including towing,
hauling, steep hill driving, commercial use, plowing, racing,
off-road use, rapid acceleration, frequent stop-and-go operation
and high ambient temperatures. These severe service operating
conditions subject the differential to extreme pressures and
operating temperatures.
New vehicles such as turbo diesel
trucks and vehicles with V-10 engines boast more horsepower
and torque than their predecessors, but differential designs
have remained virtually unchanged. Differentials today are
subjected to severe duty service and encounter more stress
and heat than was seen only a few years ago. Modern gear oils
are faced with the challenge of providing adequate wear protection
during severe service operating conditions, while also providing
maximum fuel efficiency.
In fact, according to a 2005
SAE paper entitled Breaking the Viscosity Paradigm: Formulating
Approaches for Optimizing Efficiency and Vehicle Life,
"Concurrent with the strong drive toward better fuel
economy, consumers have been demanding increased performance,
which has required axle lubricants with enhanced durability
protection and lowering operating temperatures. There has
been a 34% 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% horsepower increase since
1981."
Further evidence of stress and
increased temperatures during the differential break-in period
is documented in a 2005 SAE paper entitled The Effect
of Heavy Loads on Light Duty Vehicle Axle Operating Temperature.
A light duty GM truck towing 14,000 pounds was driven from
Orange County, California to the Nevada state line. The test
was conducted with both a new axle and a broken-in axle. Over
level ground towing, oil temperature was measured at 230 degrees
F in the new axle and 203 degrees F in the broken-in axle.
Oil temperature over the most grueling portion of the trip,
during which a maximum 6% grade was encountered , revealed
the new axle was operating at 350 degrees F and the broken-in
axle was operating at 300 degrees F. Laboratory dynamometer
test results simulating a truck hauling a trailer provided
similar results, with level ground towing temperatures recorded
at 266 degrees F with the new axle and 194 degrees F with
the broken-in axle and towing temperatures (at a 3.5% grade)
recorded at 370 degrees F with a new axle and 295 degrees
F with the broken-in axle.
AMSOIL
SEVERE GEAR 75W-90 and AMSOIL
SEVERE GEAR 75W-140 Synthetic Gear Lubes are formulated
for severe service applications, protecting differential gears
for extended drain intervals of up to 50,000 miles in severe
service and 100,000 miles in normal service, or longer where
specified by the vehicle manufacturer. Formulated with shear
stable synthetic base stocks and an extra treatment of additives,
SEVERE GEAR Gear Lubes provide unsurpassed wear protection
and friction reduction, while their excellent thermal stability
prevents thermal runaway, a phenomenon caused by a lubricant's
inability to control friction and increased heat under high
stress conditions.
AMSOIL SEVERE GEAR Synthetic
Gear Lubes are recommended for turbo diesel pick-ups, SUVs,
vans, delivery/utility vehicles, light, medium and heavy-duty
trucks, buses, heavy equipment, 4x4s, tow trucks, race cars,
tractors and motor homes.
AMSOIL
Synthetic Gear Lubes save motorists money through extended
drain intervals, and they also cost less per quart compared
to many competing OEM gear lubes.
A test on four seperate vehicles
further demonstrated the importance of changing the factory-fill
gear lube within the first few thousand miles. Oil analysis
results revealed most of the wear on vehicle one occurred
within the first 6,869 miles. Despite higher mileages, vehicles
two and three only showed slightly higher iron wear than vehicle
one. Vehicle four was the only vehicle which had the factory-fill
oil changed to AMSOIL synthetic gear lube, and despite significantly
higher mileage than the first three vehicles, it showed a
significantly lower level of wear. This test clearly demonstrates
that the heaviest amount of wear occurs early in the break-in
period. Wear is significantly reduced when the gear lube
is changed to AMSOIL synthetic gear lube following the break-in
period.
It Never Breaks Down in Your
Driveway
AMSOIL
Synthetic ATF and SEVERE GEAR Synthetic Gear Lubes Provide
Maximum Protection for Severe Operating Conditions
There is much to be done before
leaving for a vacation, not the least of which is proper vehicles
maintenance. Most people are aware of the importance of changing
their motor oil, but many people overlook the importance of
changing the automatic transmission fluid and gear lube. Proper
engine and drivetrain maintenance are equally important. After
all, if the drivetrain fails, it doesn't matter how well the
engine has been maintained. Nothing ruins a vacation quicker
than becoming stranded in a remote area due to neglecting
proper fluid maintenance.
Although many motorists consider
their everyday driving habits to be normal, this is not always
the case. In addition, some vehicles are subjected to extreme
operating conditions such as snow plowing, hauling heavy loads
and towing heavy trailers. These extremes put more stress
on drivetrain components than just driving back and forth
to work. New vehicles such as turbo diesel trucks and vehicles
with V-10 engines boast more horsepower and torque than their
predecessors, but differential designs have remained virtually
unchanged. Differentials today are subjected to severe duty
service and encounter more stress and heat than was seen only
a few years ago. Modern gear oils are faced with the challenge
of providing adequate wear protection during severe service
operating conditions, while also providing maximum fuel efficiency.
Many people overstress their
vehicles while on vacation. It is not uncommon to see vacationing
families driving around in overloaded vehicles. The roof rack
is filled with equipment, the back seat is filled with bags
and the suspension is bottomed out. Some vehicles also pull
trailers or fifth-wheels and boats, and some of these vehicles
exceed their rated towing limits. As vehicle stress increases,
transmission and differential temperatures rise and cause
conventional lubricants to thin, causing inadequate lubrication
that can lead to component failure.
Some vehicle manufacturers require
the factory-fill differential gear lube to be changed within
the first 3,000 miles, or the first 500 miles of towing, a
fact not known by many consumers. Because differentials go
through a break-in period and are not equipped with filters
like transmissions and engines, the gear lube must be changed
in order to drain the break-in wear particles. These particles,
if left in the differential, mesh between the gears and cause
gear or bearing wear or failure. Recent studies show that
the most differential wear occurs in the first 5,000 miles.
AMSOIL
Synthetic Universal Automatic Transmission Fluid (ATF)
and SEVERE
GEAR 75W-90 and SEVERE
GEAR 75W-140 Synthetic Gear Lubes (SVG & SVO) provide
maximum protection in demanding environments such as towing,
hauling and commercial use, providing increased lubricant
film protection and reduced wear at elevated temperatures.
Synthetic ATF and SEVERE GEAR Synthetic Gear Lubes are formulated
for extended drain intervals of up to 50,000 miles in severe
service and 100,000 miles in normal service, or longer where
specified by the vehicle manufacturer.
Which
AMSOIL Products Are Recommended For Your Car or Truck?
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