Abstract
This research focused on effect of commercial oil additive (COA) with engine lubricants of four-stroke motorcycle engine with 110 cc of cylinder. The mineral engine lubricant (MEL) and semi-synthetic engine lubricant (SSEL) have been applied to observe the effect of COA in volume ratio of 1:0.06. The COA was mixture physically with engine lubricants. As a preliminary observation, the mileage was 0, 200 and 300 kilometers. The basic monitoring of lubricant such as, viscosity, flash point, antiwear, oxidation number, total base number and water content, were distinguished between MEL and SSEL in the presence of COA. Blended between MEL and COA has increased the viscosity about 11.11 % from 300 km of mileage, while SSEL and COA only increased 1.25 % of viscosity. The water content analysis revealed that for 300 km of mileage has decreased about 7.72 % found in mixture of SSEL and COA form 300 km of mileage. The results of this study indicated that the role of COA can be applied as an external additive for maintenance purpose of four-stroke motorcycle engine
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