Among solvents that can be considered for oleic acid, we may mention a few: acetic acid, butyric acid, carbon disulfide, chloroform (or trichloromethane), diethyl ether, furfural, glycerol, isopropyl alcohol, octadecene, propylene glycol, tetrahydrofuran (THF), vegetable oils (in general).

oXylene

methanol is a also good solvent for oleic acid

Try adding to water and boiling to dissolve

Few Best Solvents for Oleic acid are:

Solubilities of oleic acid in several moderately polar and highly polar solvents:

Solubilities of oleic acid in the lower alcohols:

Does any one know what is the type of Surfactant that oleic acid belongs ( nonionic, anionic, cationic, amphoteric)

Oleic acid most certainly is a surfactant. It adsorbs at interfaces between solids and liquids and is, by definition, surface active.