The first thing which attracts the interest is the question, how to remove the oil from the engine. To be honest, it is not enough to drain oil and to swab details. The lubricant film still keeps. For this reason the engine continues running "without oil". And there are a lot of things from which the engine should be protected: the friction, which appears when the piston stroke up and down, also heating, as a result of fuel blend explosion.

The second thing is the engine iddle speed. Iddle speed engine operations need the lubricant film of lower quality, than full engine production. You should remember , that vapores, produced after frictions are well ventilated, and the oil, remained on detailes, are more viscous and able to protect the surface from the the seizure.
When we looked to the engine from the exhibition stand, which worked without oil, it is necessary to remember, that heating (high temperature) is an efficient cause of wearing and destruction. The exhibited engine runs without cover, it means that the temperature is lower and will not influence on quality of steel. When the detail takes extra loads, absence of ventilation leads to the piston destruction and jamming of the friction pair. Мотор со снятой крышкой
It can be seen from the above that engine runs without oil for not an appreciable length of time and on idle speed. Therewith, the engine will run in both cases, when oil contains addditive or not. We need understand, that using of car with the low oil level leads to irreversible destructive consequences. But what that got to do with the additive?

The truth about magic qualities of lubricant additives: metall plating against modifiers

You will be surprised, but the mode of oil additive functioning is not connected with the oil itself. The oil serves only as a transport facility for an active substance of the additive. Once the active substance hit where it is necessary, a protective layer is arranged under the influence of temperature or pressure. The structure and behavior of the layer depends on the type of active substance. Remetalisants contain metal particles, which fill microcracks and irregularities on the walls of the piston. This happens under the influence of temperature and pressure, and resembles the process of spreading the butter on bread. The irregularities are smoothed, the friction force is reduced, less fuel is required to maintain the previous power level. This process runs fast enough to evaluate the result in the next 300-500 km of the engine operation. Geomodificators work in a slightly different way: the abrasive composition particles under the influence of high temperatures and pressure are fused into the surface of the cylinder walls in several approaches. It doesn’t matter here if there is a microcrack or the surface is intact, geomodificator is likely to form a protective coating.

The size and uniformity of this layer should be discussed separately, because the process of manufacturing and application of high-quality and uniform ceramic protective layer is only possible in the factory conditions, when its application technology is followed. But would be a protective layer a piece of good news? Of course it would, but only partly. As we know, one of the causes of piston’s damage is the temperature which is created by both a friction and explosion of the fuel mixture. The upper part of the piston, which is affected by the explosion of the fuel mixture, is most susceptible to heat. In order metal to retain its properties and not to become deformed when heated, the heat is to be discharged. To put it briefly, the cylinder walls are used for this function, which dissipate heat to the external environment by passing it to the cooling system.

If the heat is dissipated badly or is not dissipated at all, the temperature of the metal parts is increased. Metal changes its properties and can collapse under the influence of mechanical energy. Piston
"Ceramic" coating produced by geomodifiers, poorly conducts heat, or better said, hider heat transfer. The movement of heat is interrupted, increasing thermal loads on the piston. And, when it comes to the critical values, the piston collapses under the influence of the rod pressure. As we now understand the structure and behavior of the protective layer, formed by the additives, are different. When running a car , you shouldn’t rely solely on the protective function of the layer organized by additives and do not use oil. Oil and additives perform different tasks, and should help each other to achieve certain goals.

Finaly, what will be if your engine will run without oil?

In case if you will risk and do not use oil, you will have disastrous friction wear, fatique of metal, destruction of oil extractor rings and surface of piston walls. Running of engine without oil is not appropriate. I do not encourage you do it in real life, because there will be no way to round the breakdown of engine and disastrous occurence. The exeption can be only emergency case, when your engine need to stay without oil. But do not reckon that your detailes will not be damaged and your engine will not take operational losses.