We have been using Kleenoil for approximately ten years on all our heavy equipment motors. We extended oil drain periods from four to three times, changing the Kleenoil cartridge every 250 hours. Last fall, two motors were removed primarily for blow-by, but with the hours on these motors, we felt the crank and cams would need machining. These motors had excess of 26,000 hours on them.

Our machine shop told us that they did not know what we were doing with ...