In 2004 NCWM added this to their NIST Handbook
Originally Posted By: NCWM
2.2. Diesel Fuel. – shall meet the most recent version of ASTM D975, “Standard Specification for Diesel Fuel
Oils.”
2.2.1. Premium Diesel Fuel. – All diesel fuels identified on retail dispensers, bills of lading, invoices,
shipping papers, or other documentation with terms such a premium, super, supreme, plus, or premier must
conform to the following requirements:
(a) Cetane Number. – A minimum cetane number of 47.0 as determined by ASTM Standard Test
Method D613.
(b) Low Temperature Operability. – A cold flow performance measurement which meets the
ASTM D975 tenth percentile minimum ambient air temperature charts and maps by either ASTM
Standard Test Method D2500 (Cloud Point) or ASTM Standard Test Method D4539 (Low
Temperature Flow Test, LTFT). Low temperature operability is only applicable
October 1 - March 31 of each year.
(c) Thermal Stability. – A minimum reflectance measurement of 80 % as determined by ASTM
Standard Test Method D6468 (180 min, 150 °C).
(d) Lubricity. – A maximum wear scar diameter of 520 µm as determined by ASTM D6079. If an
enforcement jurisdiction’s single test of more than 560 µm is determined, a second test shall be
conducted. If the average of the two tests is more than 560 µm, the sample does not conform to the
requirements of this part.