Our colleagues from Trico recently received a barrel of oil for engineering testing purposes and put the process to the test. We were surprised at the results. This being a gear oil, industry OEMs typically recommend around 17/14/12 for industrial gearbox use. Our results showed that the cleanliness level was at 20/19/15, unacceptable for recommended industrial gearbox use. We used a High Viscosity Hand-Held filtration unit to kidney loop the oil in the drum and managed to reduce the level of contamination to acceptable, useable condition.