Mack E7-400 Teardown

409,000 Miles Without An Oil Change!

Colonial Heights, Virginia - Haywood Gray's 1990 Mack E7-400 engine should have shown some evidence of having gone 409,000 miles without an oil change, but it didn't. "I didn't see any surprises in there at all," said owner/operator Gray when the engine was finally torn down. In fact, analysis showed the engine was as wear free as an engine in comparable service treated to 20 times the oil changes.

The results can only be credited to AMSOIL. Gray used AMSOIL Synthetic 15W-40 Heavy Duty Diesel and Marine Oil, an AMSOIL By-Pass Oil Filter, and periodic lube analysis.

Independent Engine Rater Findings Click Picture for larger more detailed view "No wear at all." "Very, very good." "No scuffing. No cavitation." "Very, very light wear." "Light wear." "Minimal wear." Diesel & Heavy Duty Diesel Products

The E7-400 was torn down by the local Mack dealership and its parts were examined by a certified independent engine rater. It showed only light to moderate wear throughout.

The rater even concluded that the engine parts could have been put right back on for continued use.

The teardown oil analysis confirmed the rater's findings. The sample's content of wear metals was extremely low: one sixth the lead and one third the iron allowed by Mack condemnation limits--- after 409,000 miles without an oil change!

Diesel & Heavy Duty Diesel Products

UPDATES!

• Haywood Gray Update 2005
• Haywood Gray Update 2004