Many metals can be reacted with organic components to form organometallics that are indeed liquids at around room temperature. Tetraethyl lead is a good example of this. It is a clear viscous liquid at room temperature with four ethyl groups (CH3CH2-)attached to the lead. So a metal like titanium can be treated this way as well. The real research and chemistry would involve finding the right organic groups to put on the metal and maximizing the properties you want to achieve by varying the organic groups. n-Butyl titanate is, for example, a viscous liquid at room temperature but reacts quickly with water or other hydroxy materials. It can actually crosslink cellulose but this is not an appropriate chemistry for oil and wear protection. So I am sure that the chemists have worked to find the right groups to attach to get the behavior they want in motor oil.