Yes! Used lubricants can be processed into various products, depending on the refining method and additive formulations. Here are some of the main products that can be obtained from used lubricants:
1. Re-refined Base Oil
- Used as a primary raw material for blending fresh lubricants.
- Can be refined to Group I, II, or even III base oil quality with advanced technology.
- Further processed into:
- Engine oil (passenger car, diesel, motorcycle oil).
- Industrial lubricants (hydraulic oil, compressor oil, turbine oil).
- Transmission fluids & gear oils.
2. Hydraulic & Transmission Oils
- By adding anti-wear, anti-oxidation, and anti-foam additives, used oil can be converted into:
- Hydraulic oil (L-HM, HVLP, HLP type).
- Gear oil (GL-4, GL-5, industrial gear oils).
- Transmission fluids (ATF, CVT, DCT fluids).
3. Fuel Oils & Heating Oils
- If refining is minimal, used oil can be blended into:
- Heavy fuel oil (HFO) for industrial boilers.
- Marine fuel (bunker fuel blend).
- Pyrolysis oil (can be further cracked into diesel-like fuel).
4. Asphalt Extender & Bitumen Modifier
- Used oil residues (bottom fractions) can be mixed with bitumen for road construction.
5. Lubricant Greases
- After refining, used oil can be mixed with thickening agents (lithium, calcium, or polyurea) to produce greases.
6. Cutting Fluids & Metalworking Fluids
- If properly treated, used oil can be repurposed into soluble cutting fluids and rust preventive oils.
7. Transformer Oil (Limited Cases)
- If the refining process is advanced, low-viscosity used oils can be processed into transformer oils.
Key Factors for Reuse:
- Quality of used oil: Some contaminants (oxidation, sludge, metal particles) may limit applications.
- Processing technology: Vacuum distillation + hydrotreating yields better-quality re-refined oils.
- Additive package: To restore performance, proper additives are required.
👉 Conclusion: Used lubricant oil is a valuable resource that can be regenerated into high-performance products, reducing waste and lowering costs. However, the success depends on refining quality and end-use requirements.
Is it possible to add the additives in cold form? And then mix?
Yes, it is possible to add additives in cold form and mix, but it depends on the type of additives and base oil properties. Here are some key factors to consider:
1. Solubility of Additives
- Some additives dissolve easily in base oil at room temperature, while others require heat to dissolve properly.
- Liquid additives (dispersants, detergents, anti-wear agents, pour point depressants) are generally easier to mix in cold form.
- Solid additives (some viscosity index improvers, pour point depressants, or extreme pressure additives) may need heat or special dispersion techniques.
2. Mixing & Homogenization
- If added in cold form, strong mechanical mixing (high-speed stirring or ultra-shear mixing) may be needed to ensure proper dispersion.
- Some additives tend to settle if not fully dissolved, requiring continuous agitation.
3. Temperature Sensitivity
- Some additives activate or blend better at elevated temperatures (e.g., viscosity index improvers, some antioxidants).
- If the base oil is too viscous at low temperatures, mixing efficiency decreases.
4. Compatibility Issues
- Some additives may react differently at lower temperatures, leading to precipitation or incomplete solubilization.
- It’s always best to conduct a small-scale test before full-scale blending.
Conclusion:
Yes, you can add some additives in cold form and mix, but efficiency depends on solubility, mixing method, and temperature conditions. If you’re working with specific additives, I can help optimize the blending process for better results. Are you working with a particular type of additive or base oil?
If you prefer to mix additives at room temperature without heating, it’s best to choose fully soluble liquid additives or easily dispersible additives. Here’s what to consider:
Best Additive Types for Cold Mixing:
✔ Liquid detergent additives – Overbased calcium sulfonate, magnesium sulfonate (ensure good solubility).
✔ Dispersants – PIBSA or boron-based dispersants (already in liquid form).
✔ Antioxidants – Liquid aminic or phenolic antioxidants.
✔ Anti-wear additives – ZDDP (zinc dialkyldithiophosphate) in liquid form.
✔ Viscosity Index Improvers – Liquid OCP (olefin copolymer) dispersions.
✔ Pour Point Depressants (PPD) – Ensure the type is soluble in your base oil at room temperature.
Blending Tips for Cold Mixing:
- Use high-shear mixing to improve solubility and dispersion.
- Always pre-mix in small batches to check compatibility.
- Choose low-viscosity base oil for easier blending at room temperature.
- Avoid solid or waxy additives, as they may not dissolve properly.