This standard specifies methods for testing the ash content of crude oil and petroleum products (excluding greases) and the sulfated ash content of unused lubricating oils and lubricating oil additives, including lubricating oil additives.
JIS K 2272:1998 history
1998JIS K 2272:1998 Crude oil and petroleum products -- Determination of ash and sulfated ash
1985JIS K 2272:1985 Testing methods for ash and sulfated ash of crude oil and petroleum products