The modern lubricants for heavy-duty engines are highly refined which otherwise may produce sludge a progressive increase in viscosity. For these reasons, the lubricants are seasoned by the addition of certain oil-soluble organic compounds to exhibits the desired properties.
Some important additives for lubrication:
- Anti-oxidant
- Anti-corrosive agents
- Pour point depressors
- Viscosity index improvers
- Antifoam agent
- Oiliness and film-strength agents
- Pressure additives
- Detergent