Examines the issues surrounding fuel lubricity by explaining the background to the problems surrounding lubricity in diesel engines. As the need for low sulphur diesels arose it became clear that a universally accepted bench test was required and ISO working group SC7/WG6 was set up in 1992 to decide on a standard test. The group recommended that an HFRR (high frequency reciprocating rig) ball‐on‐flat test should be adopted. Describes the test methodology.
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