The ratio of dispersant to oil depends on the type of lubricant, engine type, and desired performance level, but generally falls within the following ranges:
🔍 Typical Dispersant Treat Rates in Finished Oil
| Application | Dispersant Content (% by weight) |
|---|---|
| Passenger car engine oil (PCMO) | 2.0% – 8.0% |
| Diesel engine oil (HDEO) | 4.0% – 10.0% |
| Two-stroke oil | 10.0% – 20.0% |
| Hydraulic oil / gear oil | 0.5% – 2.0% (if used) |
📌 Factors Affecting the Dispersant Ratio
- Soot Handling Needs
- Diesel engines require more dispersant to manage soot → higher dosage.
- Oil Performance Standards
- Higher API/ACEA standards (like API SN, CK-4) demand more detergent/dispersant to meet sludge control specs.
- Oil Drain Interval Goals
- Longer drain intervals require more robust dispersant systems.
- Dispersant Type
- Succinimide-type dispersants (like PIBSA-PAM) are most common.
- High molecular weight dispersants offer better sludge control at lower dosages.
💡 Example Formula (for an API CI-4 diesel engine oil):
- Dispersant (PIBSA-based): 7–9 wt%
- Detergent (calcium sulfonate): 3–4 wt%
- ZDDP (antiwear): 1 wt%
- Antioxidants: 1 wt%
- Rest is base oil
⚠️ Caution
- Overuse of dispersant can:
- Increase oil solubility, affecting seal compatibility
- Dilute viscosity index improvers
- Raise cost without proportional performance benefit
The ratio of dispersant to oil can vary depending on the situation and the goals of the response job. However, a common and widely used ratio is 1:20 dispersant to oil. This means that for every gallon of dispersant used, 20 gallons of oil need to be treated.
The ratio of dispersant to oil: key to the effect of your work
Dispersants and oils are common substances in many fields, such as art, industry and domestic life. However, once the ratio between these two seemingly ordinary substances changes, it can have a profound impact on the effect of the work. In many applications, such as coatings, inks and adhesives, dispersants are used to control particle dispersion to ensure good properties of the final product. For example, when making lubricating oil, oil and dispersant can be mixed together to adjust the lubricating oil consistency and dispersion properties.
Effects of different proportions
In order to explore the effect of the ratio of dispersant to oil on the effect of the work, we conducted a series of experiments. In the experiment, we kept other parameters unchanged and only changed the ratio of dispersant and oil to observe its impact on the effect of the work.
In addition, we found that the proportion of oil will also affect the effect of the work. When the oil content is too high, the piece may be too thin and difficult to form an even coating. 2. When adjusting the ratio of dispersant and oil, it should be changed gradually to better observe its effect. 3. If the effect of the work is not good, the ratio of dispersant and oil should be readjusted instead of simply increasing or decreasing the content of a certain substance. 4. When using these two substances, you should pay attention to safety and avoid accidental ingestion or skin contact.
While the ratio of dispersant to oil has been discussed in depth, there are many other factors that may affect the final result, such as the particle size of the substance, temperature, pressure, etc. Therefore, future research can be further expanded into these areas to gain a more comprehensive understanding of the mechanism of action and application effects of dispersants and oils.