Analysis Of The Use Of Diethyl Ether Additives In Biodiesel (B20) On Diesel Engine Exhaust Gas Emissions Farda Pega Libra Gojandra, Djoko W Karmiadji Dinamika : Jurnal Ilmiah Teknik Mesin Vol. 13 No. 1 2021 DOI 10.33772/djitm.v13i1.18432