Lubricant Additive Packages: What They Do and How to Choose

October 5, 2026

An additive package, also called a performance package, is a pre-blended combination of chemical components added to base oil to make a finished lubricant. Using one balanced package simplifies blending and quality control — one drum in, one specification out — rather than dosing a dozen individual chemicals and hoping the ratios land.

What sits inside a package

• Detergents — neutralise acidic combustion products and keep hot surfaces free of deposits. Typically calcium or magnesium-based, and the source of much of an engine oil’s TBN.
• Dispersants — hold soot, sludge and wear debris in suspension so they reach the filter instead of settling on the engine.
• Anti-wear agents — form a protective film on metal under load. ZDDP is the best known, and it is central to engine and hydraulic oils.
• Antioxidants — slow the thickening and varnish formation that shortens oil life.
• Corrosion and rust inhibitors — protect metal surfaces during operation and throughout storage.
• Anti-foam agents — prevent aeration that would reduce load-carrying capacity.
• Viscosity modifiers and pour point depressants — added where the target specification needs them, though often supplied separately from the core package.

Treat rate: the number that decides cost

Treat rate is the percentage of package dosed into base oil. It ranges widely — a hydraulic fluid might take a few per cent, while a heavy-duty engine oil can take a far higher dose. Treat rate drives the finished cost of the drum more than the base oil choice often does, so it should be quoted alongside the package, not assumed.

How to choose: three questions

1. What is the finished product? Engine oil, gear oil, hydraulic fluid, transmission fluid, greases or industrial oil — each has a different chemistry demand.
2. What specification must it meet? API and ACEA levels for engine oils, OEM approvals from European and Asian vehicle makers, or a national standard for industrial fluids.
3. What base oil will it be dosed into? Mineral, Group II or Group III base stocks interact with the package differently, so the treat rate changes accordingly.

Give those three answers and a package can be named. Skipping them is how blenders end up with a batch that fails its own specification test.

Documentation to ask for

Safety data sheet, product data sheet, recommended treat rate and a certificate of analysis should accompany every lot. Where your QA requires it, retain samples are held for the agreed period after shipment.

Send us your specification

Target specification, finished product, base oil type and monthly volume are enough for us to come back with a recommended package, treat rate and indicative pricing.