1.1 ,This test method covers the quantitative determination of water in new and in-service lubricating oils and additives in the range of 10 , mg/kg to 100 ,000 ,mg/kg (0.001 ,wt./wt. to 10 ,% wt./wt.) using a relative humidity (RH) sensor. Methanol, acetonitrile, and other compounds are known to interfere with this test method.