The old saying, “If a little bit of something is good, then more of the same is better,” is not necessarily true when using oil additives.
When the specified concentrations of additives become unbalanced, overall oil quality can be affected.
Some additives compete with each other for the same space on a wear surface. If a high concentration of a special anti‑wear agent is suddenly added to the oil, the corrosion inhibitor may become ineffective. The result may only be an increase in corrosion-related problems.