<![CDATA[The use of biodiesel as fuel in light- and heavy-diesel engine vehicles in general will negatively affects thelubricant performance. the changes in lubricants properties during the use of B20 were investigated. Two type ofvehicles engines were used, namely heavy duty and light duty diesel engines. The road test was carried out until40,000 km, while the lubricant was drained and analysed only for 10,000 km of distances. The laboratory testwas conducted to observe both fresh and used lubricants. The results show that the biodiesel dilutions were lessthan 2% both in light- and heavy-duty diesel engines. The kinematic viscosities of 4 samples of used lubricantsin light-duty diesel engine were decreased in the ranges of 0.58 - 7.5%, while in heavy-duty diesel engines were4.66-16.04% from the initial values. The decreasing of TBNs were less than 14% in light-duty diesel engine andfewer than 16% in heavy-duty diesel engine fuelled by biodiesel (B20). Meanwhile, the acidity of used engine oilwas increased until 173% for light-duty diesel engine and 63% heavy-duty diesel engine compare to the initialvalues. The results show that the metal additives decreased while wear metal increased. According to this study, theincreasing of wear metal (copper) in the used lubricants were less than 23% in light-duty diesel engine and lowerthan 26% in heavy-duty diesel engine fuelled by biodiesel (B20). Meanwhile, the lead contents of used engine oilwere increased to 3.2 ppm in heavy-duty diesel engine and was not detected in light-duty diesel engine. After all,this work found that the lubricants exhibit good performances in the light- and heavy-duty diesel engines fuelledby B20. The changes of some critical properties were still in the acceptable values regarding to the specificationas required in the SNI-7069-5 (2021).]]>
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