KJSJC ENTERPRISE
409,000-Mile Oil Drain Interval Mack Engine Teardown
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After 409,000 miles without an oil change, the
truck was as wear-free as an engine in comparable
service treated to TWENTY TIMES the oil changes.
COLONIAL HEIGHTS, VIRGINIA I didnt 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 (right)
of his 1990 Mack E7-400 engine. It came out in good
shape, exactly what youd expect for a well-maintained
engine with 630,000 miles. Yet the engines oil had
not been changed for 409,000 miles!
Gray began using AMSOIL Synthetic Heavy-Duty Diesel and Marine 15W-40 Motor Oil (AME)
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.
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
The rings are very,
very good. All the
rings are free. None
are broken.
No plugging
whatsoever in the oil
rings.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
theyre in. Independent
engine rater
Additional Demonstrations
Grays successful use of AMSOIL synthetic motor oil in extended drain service is not 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 fleets 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.
Again, very, very light
wear. These could be
put right back in and
used again.
In an extended drain
program [with
petroleum oil] theres a
possibility you could
see maybe half again
as much wear.
Independent engine
rater
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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
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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
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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
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.
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
manufacturers 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 Director of Technical
Sales Dave Anderson (left) and
independent engine rater Dick
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AMSOIL Synthetic Heavy-Duty Diesel and Marine
15W-40 Motor Oil Aces Test!
whole story.
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 thats protection!
See how a
trucking company
saved $1504.90
per truck using
AMSOIL - that
would be
$300,000 for 200
trucks - CLICK
HERE
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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.
BUY AMSOIL FOR YOUR BUSINESS
AT WHOLESALE PRICES!
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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.
Sample Kits with complete analysis and two-way
postage paid
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Extreme Duty Oil
