409,000 miles without an oil change

After 409,000 miles with no oil change, an AMSOIL Synthetic Oil-protected Mack E7-400 engine in this truck was as wear free as an engine in comparable service treated to 20 times the oil changes.

Colonial Heights, Virginia -- "I didn't see any surprises in there at all. Based on what we had with the V-8, it came out the way we expected," said owner/operator Haywood Gray of his 1990 Mack E7-400 engine.

It came out in good shape, exactly what you'd expect for a well-maintained engine with 600,000 miles-- yet the engine's oil had not been changed for 409,000 miles! Here's the story.

Gray began using AMSOIL Synthetic Heavy-Duty Diesel and Marine 15W-40 Motor Oil (AME) in the E9-400 V-8 engine of a 1984 Mack truck 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.

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 Dick Malby, a certified engine rater employed by a major oil additive manufacturer.

Here's what they found when they tore the engine down...Page 2

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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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