Method for Monitoring the Degree of Clogging of the Filtration Surface of an Oil Filter

摘要

A method for determining the condition of an engine lubricant passing through an engine and a filtration apparatus (1) with a filter by-pass valve (6) comprises determining whether the lubricant needs replacing according to whether a detector (9) detects that the extent to which the by-pass value (6) is at least partially open exceeds a pre-determined value.