I think it will work. some people are already doing on this area. try to find good article fro the web.

There is a possible problem of compatibility between additives with commercial fuels. With waste oil the problem could be hidden by the poor aspect of the waste oil. So you have to examine the physical aspect of the blend.

There is another problem : a fuel additive may be inefficient in waste oil.

I suggest you look for articles, for example:

https://www.researchgate.net/profile/Reyes_Garcia-Contreras/publication/222246723_Effect_of_the_alcohol_type_used_in_the_production_of_waste_cooking_oil_biodiesel_on_diesel_performance_and_emissions/links/00b4952cbc31a29a39000000.pdf

https://www.researchgate.net/profile/David_Mclean2/publication/9040358_Biodiesel_production_from_waste_cooking_oil_2._Economic_assessment_and_sensitivity_analysis/links/0deec53971dfdeb21b000000.pdf

https://www.researchgate.net/profile/Stefano_Curcio/publication/26271014_Factor_analysis_of_transesterification_reaction_of_waste_oil_for_biodiesel_production/links/54c750b50cf238bb7d0a66a1.pdf

Article Effect of the alcohol type used in the production of waste c...

Article Biodiesel production from waste cooking oil: 2. Economic ass...

Article Factor analysis of transesterification reaction of waste oil...

i have done combustion by burner on light diesel oil and fuel additives.... it gave low emissions and enhance inflame temperature very good readings but additives with waste oil no emission reduction occurred obvious.also, there is inflame temperature enhancement more but less than that of diesel fuel oil.

thanks all doctors and professors for your efforts and i appreciate your opinions. i am working now on producing paper of blending waste oil 

Yes, definitely.  Blending might improve viscosity, surely engine performance outout still sustain. 

Yes, it is possible. It is better to convert waste oil to its methyl or ethyl esters (Bio diesel) first and blend it with additives in order to match the fuel quality standards as well as engine performance and emissions. Prior studies have shown bio diesel alone or its ethanol blends can successfully replace a portion of regular diesel and can be used in existing CI engines without any modifications.

The following articles may be helpful for you.

http://waset.org/publications/12573/phase-behaviors-and-fuel-properties-of-bio-oil-diesel-alcohol-blends

Article Experimental investigation on regulated and unregulated emis...

Article INVESTIGATIONS ON BIODIESEL FROM WASTE COOKING OIL AS DIESEL...

Article Influence of diesel fuel blended with biodiesel produced fro...

thanks, but i mean crude waste oil blended with fuel additives....not converting to methyl ester and using it inside burner not engine.

It will not work, engine gets spoiled or stop or may be erratic, also leads to knocking as it has a longer ignition delay.It results in accumulation of more fuel before combustion begins.It may lead to clogging of fuel lines due to high viscosity & low volatality. According to ASTM standards biodiesel should have viscosity 1-6 centistokes or mm2/ sec.Best way to use it is esterification which makes waste oil into biodiesel.

depends on base catalyzed transesterification process the waste cooking oils