Polyisobutenyl Succinimide (PIBSI) Dispersant
CAS Number: 84605-19-6
Polyisobutenyl succinimide (PIBSI) is the most widely used ashless dispersant in engine oil formulations, keeping soot, oxidation products, and carbonaceous deposits suspended in the oil and preventing sludge and varnish formation. The polyisobutenyl tail provides oil solubility while the succinimide head group strongly associates with polar contaminants. PIBSI is essential in every modern engine oil package from PCMO to HDEO, enabling extended drain intervals and clean engine operation.
Technical Specifications
| TBN | 10–30 mg KOH/g |
| appearance | Dark amber to dark brown viscous liquid |
| nitrogen content | 1.2–2.0 wt% |
| flash point (COC) | >180 °C |
| PIB molecular weight (Mn) | 950–2300 Da |
| kinematic viscosity (100°C) | 150–3000 mm²/s |
Applications
- Passenger car motor oil (PCMO) ashless dispersant for sludge and varnish control
- Heavy-duty diesel engine oil (HDEO) dispersant for soot and deposit control
- Automatic transmission fluids (ATF) for friction material and deposit compatibility
- Two-stroke engine oils for pre-dilution and air-cooled engine cleanliness
- Industrial circulating and gear oils requiring deposit prevention
Key Features
- Highly effective soot and sludge dispersancy prevents engine deposit buildup over long drain intervals
- Ashless formula does not contribute sulfated ash, phosphorus, or sulfur (low-SAPS compatible)
- Available in mono-, bis-, and poly-succinimide structures for optimized dispersancy and compatibility
- Post-treated (borated/maleated) grades available for enhanced dispersancy and friction performance
Grade Variants & Supplier Reference
Specific grades available from leading Chinese-market suppliers. Spec sheets and lead-time vary per grade — request a quote to confirm availability.
| Appearance | Transparent viscous liquid |
| Color Number | ≤4.0 |
| N Content, m% | 2.0-2.5 |
| Flash Point (COC), ℃ | ≥180 |
| Total Base Number, mgKOH/g | 40-60 |
| Kinematic Viscosity (100℃), mm2/s | 140-270 |
Mono-succinimide; standard low-MW dispersant for PCMO.
View on supplier site →Spec sheet not published — request TDS via inquiry form.
Bi-succinimide; higher TBN and better soot dispersancy.
View on supplier site →| Appearance | Transparent viscous liquid |
| Color Number | ≤4.0 |
| N Content, m% | 1.0-1.3 |
| Flash Point (COC), ℃ | ≥180 |
| Total Base Number, mgKOH/g | 20-30 |
| Kinematic Viscosity (100℃), mm2/s | 300-500 |
High-MW (Mn ~2000-2300); modern HDD soot dispersancy + viscosity control.
View on supplier site →Big 4 Equivalents Cross-Reference
Approximate functional equivalents from leading global additive houses (Lubrizol, Infineum, Afton Chemical, Chevron Oronite). Chemistry tier, treat rate, and additive synergy may differ — always verify against the supplier TDS before formulation lock-in.
- L-2123 (mono)
- L-2125 (bi)
- L-2034 (high-MW)
- C-9374 (mono)
- C-9378 (bi)
- C-9425 (high-MW)
- HiTEC 646 (mono)
- HiTEC 648 (bi)
- HiTEC 7172 (high-MW)
- OLOA 3700 (mono)
- OLOA 393 (bi)
- OLOA 4500 (high-MW)
Send Inquiry
CAS Number
84605-19-6
Category
Automotive Lubricant AdditivesAvailability
In StockSample
Dispatched within 5 days