409,000 miles without an oil change

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!

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 Marine 15W-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.

Additional Demonstrations

Gray's 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 showed that AMSOIL used in extended drain interval programs consistently delivered lower rates of engine wear than conventional oils used in conventional drain interval programs.

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 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 with 125,000 miles on the AMSOIL. Normal oil drains are done at 20,000 miles.

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A History of Firsts

  • First to develop an API-rated 100 percent synthetic motor oil.


  • First to introduce the concept of "extended drain intervals" with a recommended 25,000-mile/1-year drain interval.


  • First U.S. company to utilize the NOACK volatility test as a standard of performance excellence.


  • First to produce synthetic motor oils for diesel engines, racing engines, turbo and marine engines.


  • First to introduce synthetic oils that legitimately contribute to improving fuel efficiency.


  • First to manufacture synthetic gear lube for automotive use.

  • First to manufacture a synthetic automatic transmission oil for automotive use.


  • First to manufacture a 100:1 pre-mix synthetic 2-cycle oil.
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