Source: Automotive News
quote: It is essential that the lubricity of the fuel as measured by the HFRR test specified in ISO 12156-1 meets the requirement of a wear scar diameter not greater than 460 microns. In addition, it is recommended by the Diesel FIE manufacturers, that “first fill” of the fuel tank should be with fuel with good lubricity characteristics (HFRR < 400 µm) in order to guarantee good “run-in” of the injection system components. The US diesel specification (ASTM D 975-09) includes a lubricity value of 520 µm maximum (according to ASTM D 6079). It is expected that the useful operating lifetime of any mechanical component will be adversely affected by fuel with a lubricity exceeding 460 microns.