N ORDER TO TEST THE PERFORMANCE capabilities of AMSOIL Synthetic 15W-40 Heavy Duty
Diesel and Marine Oil (AME), AMSOIL sought a partner with a fleet that operated in
truly severe conditions. The perfect match was found in Duluth, Minn.-based Nordic
Waste. Nordic Waste operates a fleet of 10 International refuse haulers, providing
trash and recycling pickup to residential and commercial customers in the greater
Duluth/ Superior, WS region. Nordic's trucks operate in the bitter cold of
sub-zero winters, as well as on humid summer days that can top out at over 90ºF.
The fleet runs 12 hours a day with frequent stops and redlined starts, all while
hauling up to 22,000 lbs. of refuse and navigating the seriously steep hills of Duluth.
As if the geographic challenges aren't enough, perhaps the greatest strain a
refuse hauler's engine faces is dumping the refuse. This action requires the
engine to remain near or above redline throughout the process and shakes the truck
enough to nearly lift the front tires off the ground. Nordic's trucks dump their
contents twice daily, challenging the oil's shear stability on a regular basis.
The truck used in this study is a 2006 International 7400 rear-loading refuse hauler.
This particular truck was chosen because its Navistar DT466 engine employs a
hydraulically-actuated, electronically-controlled unit injector (HEUI) that uses
engine oil pressure to inject diesel fuel into the combustion chamber. HEUI systems
feature a variable pump (in addition to the oil pump) that pressurizes the oil
according to the fuel injection system's needs, placing a considerable amount of
additional strain on engine oil. HEUI systems can raise oil pressure to as high as
3,500 psi, creating great potential for shearing and adding signifi cant stress to
motor oil that is already operating in a severe environment. The HEUI system's
reputation for shearing less robust motor oils made the DT466 engine the perfect
choice for testing the durability of AMSOIL Heavy Duty Diesel and Marine Oil.
983-Hour Drain Interval
Nordic Waste initially installed Shell Rotella T 15W-40 Motor
Oil (239 hours). AMSOIL Synthetic 15W-40 Diesel and Marine Oil was installed for the
subsequent service interval and monitored via oil analysis. AMSOIL Diesel and Marine
Oil provided 983 hours of service before oil analysis indicated it was time to drain
the oil. As expected, the results revealed that AMSOIL Diesel Oil contained wear
metals well below International's published condemnation limits, even after
nearly 1,000 hours of service.
At approximately 8,000 hours of use, Nordic Waste brought its
International 7400 refuse hauler to a certified International Truck mechanic for a
routine teardown. The engine was virtually free of deposits, displayed minimal wear
and received high praise from the mechanic who performed the inspection.
Use of AMSOIL Diesel Oil Saves Money
Nordic Waste saves a considerable amount of money just by using
AMSOIL Synthetic Diesel and Marine Oil rather than a conventional petroleum product.
The company has used inferior products in the past, and its search for a high
performance lubricant that could withstand the punishment its fleet delivered led it
"With the big hills, high heat and extreme cold we work in, nothing has
performed better," said Nordic Waste Owner Brian Johnson. Prior to discovering
AMSOIL, the conventional lubricants Nordic used would shear out of viscosity- grade
rapidly and need to be changed at approximately 200 hours of service. Upon switching
to AMSOIL Synthetic 15W-40 Diesel and Marine Oil, Nordic Waste increased the average
drain interval for its trucks from approximately 200 hours to nearly 1,000 hours. In
addition, Nordic's use of AMSOIL Diesel Oil means the company's trucks are
well-protected and run at optimum fuel economy, so they stay out of the shop and on
"We experience less downtime and have seen reductions in costs associated with
engine overhauls and replacement parts," said Johnson. "We buy
significantly less oil, fewer fi lters and we experience lower labor costs. Our
biggest savings have been the reduced number of engine overhauls and replacement
Use of AMSOIL Synthetic 15W-40 Diesel and Marine Oil saves Nordic Waste
thousands of dollars in oil alone, in addition to reduced expenses for labor, filters
and waste oil and used filter disposal.