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This paper is a continuation of work previously discussed in SAE 2014-01-0179 [1] and SAE 2015-01-0805 [2], which was intended to improve the capability and precision of the Ignition Quality Tester (IQT™) and associated ASTM D6890 [3]/CEN EN 15195 [4]/EI IP 498 [5] Test Methods. The results presented in those two papers indicated how the new generation of IQT™ with the TALM Precision Package upgrade can markedly improve the precision of the ASTM D6890, CEN EN 15195 and EI IP 498 Derived Cetane Number (DCN) test methods. This paper will evaluate the performance of the upgraded instruments over the past 21 months of their participation in ASTM’s National Fuel Exchange Group (NEG) diesel fuel exchange program.

This paper presents the results of a mini Inter-Laboratory Study (mILS) that is a continuation of earlier work, published in SAE paper number 2014-01-0179 [1]. This work was aimed to improve the capability, precision, and durability of the Ignition Quality Tester (IQT™) and ASTM D6890 [2]/EN15195 [3] Test Methods. The mILS was performed to determine how much the TALM IQT™ Precision Package would improve the precision of four IQT™s, relative to a larger number of IQT™s participating in two separate Fuel Exchange Programs (FEPs). Two of the IQT™s were located at AET and the other two were located at two different external laboratories. All four IQT™s were equipped with the TALM Precision Package. Nine fuel samples from the two FEPs with reference DCN values from 33 to 82 were selected for testing.