The document discusses the engine teardown of a Freightliner truck with a Cummins ISX 500 engine that was used by Freestate Petroleum Distributors. The engine was run for over 1,000,000 km using Delo 400 Multigrade oil and Caltex Extended Life Coolant. Upon teardown, the engine parts showed minimal wear and deposits, including pistons and rings with limited deposits, clean piston liners, minimal camshaft and bearing wear, and clean radiator tubes. This demonstrated the protection provided by Delo 400 Multigrade oil and Caltex Extended Life Coolant in allowing the engine to reach over 1,000,000 km with reliability. Freestate will refill the rebuilt engine with the same