【TBT】DUS 2052:2018, Standard Test Method for Measuring the Effect on Filterability of Engine Oils After Treatment with Water and Dry Ice and a Short (30 min) Heating Time, First Edition.
【TBT】DUS 2063:2018, Standard test method for measuring the effect on filterability of engine oils after treatment with various amounts of water and a long (6-h) heating time, First Edition.