Sharing the Miles Together
Haywood Gray and His AMSOIL Legacy
is no coincidence that the name Haywood "Woody"
Gray holds a special significance in AMSOIL circles. Gray's
story has been featured in dozens of AMSOIL publications
including the ACTION NEWS, SERVICE LINE, DIRECT LINE,
a small library of brochures and pamphlets and even video
tapes documenting his experiences with AMSOIL extended
drain intervals. His experiences stand as an example of
AMSOIL quality and cost savings for all to see.
Way Back When the Old Stuff Was New, Haywood Gray began
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 even 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, which were 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 an E7-400 engine. He also determined
that the new truck would also be the start of a new oil
draining program. He decided that instead of using his
previous 100,000-mile oil change guidelines, he would
base his oil drains on the findings of a used oil analysis
program. He also installed an AMSOIL By-Pass Filtration
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
What the team found was surprising to everyone -except
perhaps Haywood Gray.
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. And all this after 409,000 miles
without an oil change!
What's Woody Doing Now?
is now driving a 1999 Mack® with an ET 460 engine,
an Eaton 13 speed transmission and 386 Eaton rears. Upon
acquiring the truck, Gray had the drive train filled with
AMSOIL 75W-90 Gear Lube and the engine changed over to
his old favorite - AMSOIL Synthetic Heavy-Duty Diesel
and Marine 15W-40 Motor Oil. He also had a BMK-12 By-Pass
Filtration system installed.
of July 2003, Gray has over 330,000 miles on the engine,
and has racked up 290,000 miles without an oil
change. He has decided to change filters and
take oil samples at 40,000-mile intervals. So far, the
samples have shown that the oil has not needed to be changed.
Soot levels have also remained well within the recommended
Mack® limits. The truck is greased with AMSOIL products
every 40,000 miles when it is time for a filter change.
Gray likes to point out that his fuel mileage is a constant
7 mpg, while other truckers travelling under similar circumstances
and with similar equipment average only 5.5 to 6 mpg.
But he also knows that's just one of the many benefits
AMSOIL has to offer. And if you have time, he might be
able to tell you a thing or two about extended drain intervals.