Methods of test for full-flow lubricating oil filters for internal combustion engines - Part 9: Inlet and outlet anti-drain valve tests (First revision) (ISO 4548-9:2008, IDT)
This Malaysian Standard specifies methods of measuring the effectiveness of either inlet or outlet anti-drain valves if fitted to a full-flow lubricating oil filter of the 'spin-on' or 'easy change' type, for internal combustion engines.
