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Two pickup trucks, both with 5.9 L, turbocharged and intercooled, direct injection diesel engines, were tested for regulated emissions at the Los Angeles County Metropolitan Transit Authority Emissions Testing Facility, one in 1994 and the other in 1995. Emissions testing was conducted using the Dynamometer Driving Schedule for Heavy Duty Vehicles (Code of Federal Regulations 40, Part 86, Appendix 1, Cycle D). Emissions data generated included total hydrocarbons (HC), carbon monoxide (CO), carbon dioxide (CO2), oxides of nitrogen (NOx) and particulate matter (PM). All tests were with a chassis dynamometer capable of transient testing. This paper presents an analysis and comparison of the emissions tests for each year as well as a comparison between years. Differences in emissions found between years are reported. Test methods, procedures and the experimental designs are discussed. The test data presented in this report represents the emissions of three biodiesel fuel blends.