Choice of thinner depends on the nature of the paint.
Normally air drying paints like alkyds can be thinned with mineral turpentine oil. In a worst case scenario, you can use kerosene but it may not give good results.
Stoving paints require a mix of solvents for good performance. Xylenes and Toluene are common hydrocarbons, butanol and methanol are common alcohols. We also have butyl acetate, MEK, MIBK and acetone used in thinners. Oxygenated solvents like cellosolve and its derivatives are also used. Depending on the polarity of the paint, the constituents of the thinner also changes.