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Motor
Oil Test & Comparison - The Most Comprehensive Test Results
Ever Published by AMSOIL
AMSOIL 409,000-Mile Oil Drain
Interval Mack Engine Teardown
 After
409,000 miles without an oil change, the AMSOIL-protected
Mack E7-400 engine in this truck was as wear-free as an engine
in comparable service treated to TWENTY TIMES the oil changes.
COLONIAL HEIGHTS, VIRGINIA
– “I didn’t see any surprises in
there at all. Based on my experience with AMSOIL Motor Oil,
it came out the way we expected,” said owner/ operator
Haywood Gray (left) of his 1990 Mack E7-400 engine. It came
out in good shape, exactly what you’d expect for a well-maintained
engine with 630,000 miles. Yet the engine’s oil had
not been changed for 409,000 miles!
Gray began using AMSOIL
Synthetic Heavy-Duty Diesel and Marine 15W-40 Motor Oil (AME)
in the E9-400 V-8 engine of his first truck, a 1984 Mack,
after the engine accumulated 45,000 miles. For 280,000 miles,
Gray changed his oil at 40,000-to 60,000-mile intervals though
his oil analysis reports showed, without exception, that the
oil was good for continued use. At 325,000 miles, Gray increased
his oil drain interval to 100,000 miles. The engine was torn
down at 600,000 miles when Gray decided to sell the truck.
The cylinder liners, bearings, pistons, rings and oil pump,
all treated to extended oil drain intervals with AMSOIL, were
found to be in excellent condition. Gray continued using AMSOIL
AME in the engine of his new truck, a 1990 Mack with a E7-400
engine. With the new truck, instead of using 100,000 mile
drain intervals, Gray began basing his oil drains on the findings
of a used oil analysis program. He also installed an AMSOIL
By-Pass Oil Filter. After 630,000 miles total and 409,000
miles without an oil change, the E7-400 engine was torn down
by the local Mack dealership in December 1996 and its parts
were examined by an engine rater from a major oil additive
manufacturer.
Findings
The engine showed light to moderate
wear throughout, just as an engine in similar service and
lubricated with conventional oil changed at 15,000- to 20,000-mile
intervals would show. In fact, according to the engine rater
the parts he examined – cylinder liners, pistons, rings,
bearings, valve train components – could have been put
right back in the engine and would have continued to provide
the good, dependable service they had provided all along –
after 409,000 miles without an oil change!
Discussion
Many factors enable AMSOIL to be safely
used 20 times longer than petroleum oils may be used:
Stability –
AMSOIL Synthetic Heavy-Duty Diesel and Marine 15W-40 Motor
Oil is far less prone to thermal and oxidative breakdown than
are petroleum oils. Stability inhibits the formation of carbon
deposits, varnish, sludge and acids, which helps the engine
run clean and protected.
Neutralization ability
– While rapid TBN loss often renders conventional
oils unfit for continued use, 12 Total Base Number (TBN) AMSOIL
Synthetic Heavy-Duty Diesel and Marine15W-40 Motor Oil offers
lasting protection against engine corrosion.
Viscosity retention
– Some conventional oils’ viscosity slips
out of specification within a few thousand miles of an oil
change. AMSOIL Synthetic Heavy-Duty Diesel and Marine 15W-40
Motor Oil neither loses viscosity as shear-prone oils do,
which promotes wear during high temperature operations, nor
gains viscosity as oxidation-prone oils do, which promotes
wear during startup and cold temperature operations.
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“The pins show
no wear at all. The piston crowns and lands show a normal
amount of carbon. The skirts are very clean with a few
fine vertical lines.”
– Independent engine rater |
“Probably
95 percent of the crosshatching is still in the liners.
No scuffing, no cavitation in the liners. The liners could
go back in the condition they’re in.”
– Independent engine rater |
“The rings are very, very good. All the rings are free.
None are broken. No plugging whatsoever in the oil rings.”
– Independent engine rater |
Additional Demonstrations
Gray’s successful use of AMSOIL
synthetic motor oil in extended drain unique. AMSOIL has conducted
demonstrations with fleets all over North America. In each
instance AMSOIL has been proven safe and effective in extended
drain use. In fact, these studies show that AMSOIL used in
extended drain interval programs consistently delivers lower
rates of engine wear than conventional oils used in conventional
drain interval programs.
The rater found the valve
train components showed, “very light wear. Very good.
[I] find no wear on the shaft, which can be a heavily loaded
area.”
Southern over-the-road
fleet – AMSOIL was used in Cummins class 8
engines for 75,000-mile drain intervals; the fleet’s
normal drain intervals were 15,000 miles.
Upper midwest grocery
fleet – AMSOIL was used in Cummins NTC 350
engines for 74,000-mile drain intervals; normal drain intervals
were 12,000 miles.
Northern grocery fleet
– AMSOIL was used in Detroit Diesel Series
60 engines for 79,000-mile drain intervals; normal drain intervals
were 20,000 miles.
Virginia Beach, Virginia
owner/operator – AMSOIL was used in Cummins
350 engine for 325,350 miles without a drain.
Midwestern trucking
fleet – AMSOIL was used in Detroit Diesel Series
60 engines for 60,000-mile drain intervals; normal drain intervals
were 20,000 miles.
Northern tier over-the-road
fleet – In an ongoing demonstration, AMSOIL
Series 3000 5W-30 is being used in a fleet of Cummins N-14
engines for extended drain service with oil drains based on
the findings of used oil analysis. One change was performed
at one year with 125,000 miles on the AMSOIL. The oil was
recommended for continued use. Normal oil drains are done
at 20,000 miles.
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“Again, very, very light wear. These could be put right
back in and used again. In an extended drain program
[with petroleum oil] there’s a possibility you
could see maybe half again as much wear.”
- Independent Engine Rater |
“Light wear. They compare to [those in] an engine that
had 15,000- to 20,000-mile [petroleum] oil and filter
changes.”
- Independent Engine Rater |
“Minimal wear. These, too, compare to [those in] an engine
that had 15,000- to 20,000-mile [petroleum] oil and
filter changes.”
- Independent Engine Rater |
Except for normal top polishing
on the push tubes the rater found, “no wear to speak
of. These can go right back in the engine and be used again.”
The push tubes were put back into the engine and are in use
today.
“I see no reason why
it [the engine] couldn’t run on.” – Independent
engine rater.
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| AMSOIL Director of Technical Sales
Dave Anderson (left) and independent engine rater Dick
Maltby. |
WHAT MAKES AMSOIL SO
GOOD? “Synthetic basestocks, top-quality additives,
and most importantly, more experience formulating synthetic
motor oils than any other oil company,” says AMSOIL
Director of Technical Sales Dave Anderson.
“AMSOIL first put a long-drain
synthetic diesel oil on the market in 1975 and since then
has introduced three other long-drain synthetic diesel oils.”
DOES AMSOIL OFFER A
WARRANTY?
“Yes. AMSOIL warrants that the use of its lubricants
will not cause mechanical damage to any mechanically sound
equipment when AMSOIL products are used in full compliance
with AMSOIL recommendations.
“AMSOIL extended drain
interval recommendations are set at a minimum of two times
or more than the engine manufacturer’s recommendations
as determined by oil analysis. Diesel operators who use AMSOIL
for extended drains are fully protected.
“Studies have proven time
and again that extended drain intervals with AMSOIL are a
win/win situation – truckers win with less downtime
and oil expense and they win big with reduced engine wear.”
AMSOIL Synthetic Heavy-Duty
Diesel and Marine 15W-40 Motor Oil Aces Test!
Haywood Gray has his used oil
tested regularly to ensure the ongoing serviceability of the
oil and well-being of the engine. In the engine oil report
card, wear metals tell the whole story. A high wear metal
content indicates a high rate of engine wear. In fact, most
engine manufacturers publish upper limits on wear metals content
at which an oil must be changed to assure continued engine
protection. Even after 409,000 miles, AMSOIL protected better
than Mack limits required. Now that’s protection!
What Is Oil Analysis?
Oil analysis is a maintenance management
tool that allows users to monitor equipment condition for
maximum equipment life, maximum lubricant drain interval length
and optimal downtime scheduling. Oil analysis saves users
significant money by reducing equipment replacements and repairs,
reducing the volume of lubricant purchased and destined for
disposal and, most of all, by reducing downtime.
Oil analysis customers like
Haywood Gray “trendline” their oil analyses. Trendlining
involves comparing the results of previous oil analysis reports
to those of the most recent report to establish trends in
wear metals content, viscosity, acid content, acid neutralization
ability and other characteristics as specified. Departures
from established trends indicate a change in engine or lubricant
condition and the information they provide may be used to
correct abnormal conditions before they cause damage or failure.
AMSOIL Oil Analysis
The AMSOIL oil analysis program puts
technologically advanced testing equipment in the hands of
experienced diagnosticians to deliver accurate, reliable,
useful results.
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