Influence of quaternary combinations of biodiesel/methanol/n-octanol/diethyl ether from waste cooking oil on combustion, emission, and stability aspects of a diesel engine Enhancement of the combustion and stability aspects of diesel-methanol-hydrous methanol blends utilizing n-octanol, diethyl ether, and nanoparticle additives Improvement of the combustion, emission, and stability features of diesel‑methanol blends using n‑decanol as cosolvent Enhancement of the waste cooking oil biodiesel usability in the diesel engine by using n-decanol, nitrogen-doped, and amino-functionalized multi-walled carbon nanotube Enhancement of the diesel fuel characteristics by using nitrogen-doped multi-walled carbon nanotube additives