The employment for which Oil Vehicles were initially meant and the influence of Tempera techniques on Oil painting in Mediterranean lands are first discussed. The working qualities sought for (Flanders, Netherlands) will be dealt with in relation to consitency and initial setting of paints. Oil vehicles in the trade are compared to 15 to 17 century products, enumerating and briefly discussing ingredients traditionally employed in their preparation. Lead White was considered and still is the safest drier. The author's experiments in the preparation of oil vehicles according to traditional methods are commented on; drying raw oils, strong drying boiled oils, thickened oils; the use and importance of walnut oil, the preparation of fluid and clear walnut oil vehicles and their working properties are stressed. Some experiments are shortly described; cheap and easy-obtainable materials; elementary manipulation of processes with control and care regarding amount, time and temperature. Old texts are quoted. The problem being to obtain a Vehicle with a quick initial setting allowing wet in wet painting, experiments demonstrate that ancient oil vehicles were of the nature of a drying thin stand oil: extremely clear and colourless; partially polymerized (by heat i. E. Freedom of after yellowing); partially oxidized (air admitted and eventually dries i.e. Good drying rate); of good fluidity (mobility; flowing) but viscous and thixotropic (paints set up quickly i.e. Working facilities, no need of essential oils); partially saponified if lead compounds are introduced. Thus resinous media are discarded except for special purposes. To bleach the product well is of the greatest importance. It should be used with linseed and/or walnut oil colours according to traditional painting techniques.