【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.
【TBT】DUS 2064:2018 Standard Test Method for Multielement Determination of Used and Unused Lubricating Oils and Base Oils by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES), First Edition.