This study investigated polycyclic aromatic hydrocarbon (PAH) and regulated harmful matter (traditional pollutant) emissions, fuel consumption, and the assessment of the inferior condition of engine oil from heavy-duty diesel engines (HDDEs) fueled with palmbio-diesel-PDF (premium diesel fuel) blends and paraffinic-palmbiodiesel blends under brand-new (the mileage was zero) engines accumulated mileage test. Experimental results indicated that the emissions of THC and CO increased with operation time but the emissions of NOx and PAHs decreased with operation time between 0 and 300 h (18,000 km). Using palmbiodiesel-PDF blends or paraffinic-palmbiodiesel blends instead of PDF in HDDEs reduced the emissions of THC (10.7-44.2%), CO (0.664-15.6%), CO2 (0.763-2.55%), NOx (1.25-4.97%), PM (6.11-26.8%), total PAHs (43.0-90.2%) and total BaPeq (63.1-89.6%) significantly. (c) 2006 Elsevier Ltd. All rights reserved.