What is NOT one of the basic functions of a lubricant?

The function of a lubricant is fundamentally to reduce friction between surfaces in contact, thereby helping to minimize wear and improve efficiency in mechanical systems. When considering the basic functions of lubricants, one crucial role is to keep surfaces apart, which prevents metal-to-metal contact and reduces wear. Additionally, lubricants play a key role in cooling and cleaning components by dissipating heat generated from friction and carrying away contaminants.

While lubricants are indeed designed to minimize friction and wear, the aspect of increasing surface friction is contrary to the purpose of lubrication. Lubricants aim to decrease friction in order to facilitate smoother operation and prolong the life of mechanical parts. Thus, stating that a lubricant increases surface friction does not align with its fundamental purpose within machinery. This makes the option about increasing friction incorrect regarding the basic functions of a lubricant.