The　current　study　intends　to　assess　the　impact　of　incorporating　an　oxygenated　fuel　additive　(hydrogen　peroxide　(H2O2))　into　a　biodiesel/diesel　fuel　mix　on　diesel　engine　combustion　efficiency　and　instability.　The　combustion,　performance,　and　emission　properties　were　evaluated　using　advanced　test　equipment　to　offer　a　full　study.　The　combustion　instabilities　in　terms　of　cyclic　fluctuations　were　investigated　to　discover　any　unusual　behavior　when　H2O2　was　added　to　biodiesel/diesel　fuel　mixtures.　Statistical　and　continuous　wavelet　transformations　were　used　to　investigate　the　cyclic　fluctuations　in　peak　cylinder　pressure　and　indicated　mean　effective　pressure　(IMEP).　Diesel,　B20　(20%/80%　of　biodiesel/diesel　fuel),　B20H5　(20%/5%/75%　of　biodiesel/H2O2/diesel　fuel),　and　B20H10　(20%/10%/70%　of　biodiesel/H2O2/diesel　fuel)　were　tested　in　the　study.　Experiment　results　indicated　that　B20H10　produced　the　best　results.　In　comparison　to　B20,　B20H10　improved　BTE　by　6.56%　and　HRR　by　8.5%,　while　decreasing　BSFC　by　7.98%,　CO　and　HC　emissions　by　26.5%,　and　6.67%,　respectively.　Furthermore,　the　peak　pressure　and　IMEP　cyclic　changes　were　also　well　within　permissible　ranges.　However,　it　was　shown　that　adding　H2O2　to　B20　increased　NOx　emissions.　The　cyclic　variations　in　the　cylinder　peak　pressure　and　indicated　mean　effective　pressure　were　analyzed　using　statistical　methods　and　continuous　wavelet　transformation.　No　abnormality　was　detected　in　cyclic　variation,　thus　ruling　out　any　unsafe　behavior　in　introducing　test　fuel　additive　to　biodiesel　blends.　In　principle,　introducing　H2O2　into　a　biodiesel/diesel　fuel　mix　helped　improve　the　engine　performance　and　emissions　while　having　no　negative　effects　on　engine　life.