Chainarong Apinhapath creator Samorn Muttamara Chairperson Weihan, Su Examination Committee Stoll, -Ing. Uwe Examination Committee Government of Korea Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1994 continuing eng 67 leaves The exhaust emission of motorcycles was studied to determine the correlation between the emissions, CO, HC, NOx, and white smoke, and the types of lubricating oil, regular and low smoke oil. The motorcycles are selected randomly from the motorcycle taxies of which their cylindrical capacity is less than or equal to 125 cc. The engine and oil tank were cleaned before adding the test autolube oil. The emissions were measured at every 1,000 km of distance driven up to 5,000 km using both the regular and the low smoke oils. By the action of PIB containing in the low smoke oil, visible smoke was reduced to 51.8% in the new motorcycle and 71.8% in old motorcycle. There is no difference on pollutants emission when using the low smoke and the regular oil. Similar results were obtained from emission loading measurement in which the test motorcycles were driven on a chassis dynamometer according to the standard driving pattern. In addition, CO emission is not depended on the period of service of motorcycle. The relation is unclear on HC emission and period of service of motorcycle. Moreover, there is a possibility that low smoke oil will reduce NOx emission in some model of motorcycles. A thesis submitted in partial fulfillment of the requirement for the degree of Master of Science, School of Environment, and Resources & Development Thesis (M.Sc.) - Asian Institute of Technology, 1994 Waste gases Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B15844 http://203.159.5.9/ait-thesis/detail.php?q=B15844 230399 20260818113006.0