Introduction to Ashless Dispersant
Ash-free dispersants are indispensable core components in modern engine oil formulations. They are a type of organic compounds, and their core feature is that they do not produce metallic ash after working at high temperatures inside the engine, hence the name "ashless". Their main mission is to keep the interior of the engine clean.

1.Core function: The "cleaner Guardian" of the engine
Ashless dispersants function through two key mechanisms:

Dispersion effect: During engine operation, solid or gel-like contaminants such as low-temperature sludge, paint films and carbon deposits are produced. Dispersants can encapsulate these tiny particles. Through the repulsive force of charges and the steric hindrance effect, they can be stably suspended in the engine oil, preventing them from aggregating and depositing on engine components.

Solubilization effect: The oxidation of engine oil can generate various polar substances. Dispersants can act like "capsules", dissolving these harmful liquid substances that are insoluble in oil into the centers of their micelles, thereby inhibiting the formation of sludge and paint films.

In simple terms, they are like the "suspending agents" in engine oil, catching and dispersing the dirt instead of allowing it to clump and settle, thus ensuring the smoothness of the oil passage and the cleanliness inside the engine.

2. Detailed description of main models: T151, T154A, T161
These three dispersants all belong to the polyisobutylene succinimide family, and their performance differences mainly stem from the molecular weight and chemical structure of the polyisobutylene chain.

T151 (Succinimide)

This is the basic member of the family. It has excellent low-temperature dispersion performance and can effectively inhibit the formation of low-temperature sludge.

Characteristics: Its molecular structure enables it to provide good dispersibility while also possessing certain antioxidant and anti-wear properties.

Application: Widely used in gasoline engine oil, especially in scenarios with high requirements for low-temperature sludge control, and also frequently used in two-stroke engine oil.

T154A (Polyisobutylene succinimide)

It can be regarded as an upgraded version of T151, featuring a higher molecular weight and a longer polyisobutylene chain. This brings about superior high-temperature cleaning performance and dispersion stability.

Features: It can more effectively prevent carbon deposits and paint film deposition at high temperatures, and its dispersion ability is also more lasting.

Application: It is one of the main dispersants for formulating medium and high-grade diesel engine oil, Marine cylinder oil, and engine oil that meets stricter environmental protection standards.

T161 (High Molecular Weight Polyisobutylene succinimide)

This is a high-performance representative in this family, featuring an extremely high molecular weight. Its extremely long polymer chains endow it with an extremely powerful dispersing ability.

Feature: It is particularly adept at handling the large amount of soot produced by incomplete combustion in diesel engines. It can effectively prevent the sharp increase in engine oil viscosity and filter clogging caused by the accumulation of soot particles, providing long-term protection for the engine.

Application: Mainly used in top-grade gasoline engine oil and heavy-duty diesel engine oil, it is a key additive to meet the requirements of long oil change intervals and extremely harsh working conditions.

A simple summary of the relationship among the three:

T151 is the basic type and is good at dealing with low-temperature oil sludge.

T154A is an enhanced type that strikes a balance between high and low temperature performance, making it more versatile.

T161 is an expert type, specifically designed to deal with the most intractable problems of soot and high-temperature deposits.

3. Main Functions and Benefits
Keep the engine clean: Prevent sludge, paint film and carbon deposits from depositing in key parts such as pistons, ring grooves and fuel lines.

Extend the service life of engine oil: By suspending contaminants, it delays the deterioration of engine oil and supports a longer oil change cycle.

Protecting the engine: A clean operating environment means less wear, lower friction and more stable performance.

Reduce emissions: Assist in maintaining the efficient operation of engines and be more friendly to modern exhaust after-treatment systems.

4. Application scenarios
Ashless dispersants are essential components of almost all internal combustion engine oils, and their importance is particularly prominent in the following scenarios:

Frequent start-stop urban working conditions (prone to generating low-temperature sludge).

Diesel engines that operate at high loads for long periods of time (prone to generating soot and high-temperature deposits).

Engines that pursue long oil change intervals.