Additives

Calcium – Detergent, Dispersant, Anti-corrosion, Neutralizes acids

Phosphorus - Anti-wear and extreme pressure additive, Corrosion inhibitor in coolants, Combustion deposit reducer in engine oils.

Zinc – Anti-wear additive, Anti-oxidant, Corrosion inhibitor. Some sealing compounds. With high copper: brass/bronze wear.  Without copper: Galvanized pipes. 

Barium – Corrosion and rust inhibitor, Detergent, Anti-wear and Extreme Pressure additive.  Additive in some fuels.