In modern diesel engine lubrication, the role of the ashless dispersant has become more critical than ever. An ashless dispersant is a type of lubricant additive designed to keep engines clean by preventing soot, sludge, and oxidation by-products from forming deposits. Unlike conventional metal-containing detergents, it is completely metal-free, meaning it does not produce ash residue that can block diesel particulate filters (DPF) or harm after-treatment systems. The most widely used chemistry behind this technology is polyisobutene succinimide (PIBSI), which provides both strong dispersing power and thermal stability across a wide range of operating conditions.
As emission standards tighten worldwide and engines are designed for longer drain intervals, the need for low SAPS (Sulphated Ash, Phosphorus, Sulfur) lubricant systems is growing. This is where ashless dispersants prove indispensable—they maintain oil cleanliness while protecting sensitive exhaust treatment components. For formulators and lubricant manufacturers, using a reliable ashless dispersant means achieving a cleaner engine, extended oil life, and compliance with stringent API CK-4 and Euro VI standards.
He Ao, a professional lubricant additive supplier based in China, provides a full range of polyisobutene succinimide-based ashless dispersants tailored for diesel engine oils. Products such as He Ao HA151, HA154, and HA161B are developed to meet both performance and environmental requirements. Supported by its two production facilities and third-party testing partnerships, He Ao ensures consistent quality and flexible supply solutions for international buyers seeking dependable additive sourcing for high-performance diesel formulations.
Diesel engines today operate under significantly more demanding conditions than a decade ago. Higher combustion pressures, increased soot generation, and elevated operating temperatures create a challenging environment for engine oil. Conventional additives, especially metal-containing detergents, often fail to maintain optimal engine cleanliness under these conditions. They can contribute to ash deposits, which reduce the efficiency of diesel particulate filters (DPF) and accelerate wear in modern engines. As a result, high-performance ashless dispersants have become essential components in diesel engine oil formulations.
Key factors driving the adoption of advanced ashless dispersants include:
He Ao has developed a series of ashless dispersants specifically engineered for these challenges. Products like HA154B boronized bis-succinimide and HA161 high-molecular polyisobutene bis-succinimide offer excellent thermal stability and soot handling, making them suitable for heavy-duty, long-drain diesel oils. Partnering with He Ao gives you access to additives that meet current diesel engine demands while providing formulation flexibility.
Ashless dispersants function by keeping insoluble particles such as soot and sludge suspended in the oil, preventing their deposition on critical engine surfaces. The chemistry most commonly used is based on polyisobutene succinimide (PIBSI), which combines a long-chain hydrocarbon backbone with a polar succinimide group. This structure allows the additive to solubilize and disperse particulate matter effectively while resisting thermal degradation.
He Ao offers a variety of PIBSI-based dispersants tailored for different engine and oil requirements. The main products include:
| Product | Chemical Type | Molecular Type | Key Features | Typical Applications |
|---|---|---|---|---|
| HA151 | Polyisobutene Mono-Succinimide | Low molecular | Good dispersibility, suitable for light-duty diesel oils | Light-duty diesel engine oils |
| HA154 | Polyisobutene Bis-Succinimide | Medium molecular | Excellent soot control | Heavy-duty diesel engine oils |
| HA154B | Boronized PIB Bis-Succinimide | Medium molecular | Improved thermal stability | High-performance diesel formulations |
| HA161 | High Molecular PIB Bis-Succinimide | High molecular | Enhanced film strength | Marine & industrial diesel engines |
| HA161B | Boronized High Molecular PIB Bis-Succinimide | High molecular | Best oxidation resistance | Premium diesel oils |
This product range allows formulators to select the right dispersant for specific diesel engine applications, whether it is for heavy-duty trucks, agricultural machinery, or marine engines.
Compared to traditional metal-containing additives, ashless dispersants provide several clear advantages for diesel engines:
For example, formulations using He Ao HA161B have demonstrated superior soot handling and oxidation resistance in bench tests, making them suitable for modern heavy-duty diesel engines under high-stress operating conditions.
He Ao’s ashless dispersants are compatible with a wide range of base oils, including Group II, Group III, and PAO. They also work synergistically with detergents, antioxidants, anti-wear agents, and other lubricant additives to achieve optimal performance. Recommended treat rates typically range between 2–6% depending on engine type and oil specification.
Environmental and regulatory compliance is a critical factor for modern diesel oils. Ashless dispersants reduce metal residues in lubricants, contributing to low SAPS formulations that protect DPF and SCR systems. Products from He Ao comply with global standards, including:
Produced under ISO-certified manufacturing standards, He Ao’s dispersants provide reliable quality, consistent performance, and a sustainable solution for global lubricant formulators.
He Ao established in 2024 in Hebei Province, China, operates as a professional international trading company specializing in lubricant additives. By integrating resources from its two locally invested factories—Shijiazhuang Runjin Lubricant Additive Co., Ltd. and Shijiazhuang Jubai Oil Co., Ltd.—He Ao ensures stable production, strict quality control, and competitive pricing. Runjin is also a president unit of the Hebei Oil Industry Association, underscoring industry credibility.
He Ao works closely with international third-party testing agencies such as SGS and INTERTEC to verify product quality and supports custom formulations to meet special specifications. Technical services include formulation guidance, bench testing, and API certification consulting. The company maintains a global reach, serving markets in the Middle East, Southeast Asia, and North America, providing reliable and efficient supply chains for B2B customers.
For B2B purchasers, He Ao’s ashless dispersants offer significant value:
By choosing He Ao, you gain a trusted partner who provides not only high-performance ashless dispersants but also comprehensive procurement support to reduce costs and improve efficiency. Contact He Ao today to request technical data sheets, samples, or consultation for your diesel engine oil formulations.
