Sample Test Machine Type Make Selection Hydraulic System Gearbox Turbomachinery Diesel Engine Compressor/Chiller Rolling Element Bearing Current Oil Cleanliness Make Selection 26/23 25/22 24/21 23/20 22/19 21/18 20/17 19/16 18/15 17/14 16/13 15/12 14/11 13/10 Cleanliness after filtration Make Selection 20/17 19/16 18/15 17/14 16/13 15/12 14/11 13/10 12/9 11/8 10/7 –