Detergent additives: types, chemical properties and use in motor oil formulations
2026-11-05
Detergent additivesare important functional components of modern motor oils. They are designed to control high temperature deposits, reduce the formation of varnish films and carbon deposits, and keep engine internal parts clean. During engine operation, fuel combustion, oil oxidation and exposure to high temperatures lead to the formation of acidic compounds, precursors to sludge and other deposits. If these substances are not properly controlled, they can reduce oil performance and increase the risk of engine component wear.
For lubricant manufacturers and additive formulators, the correct choice of detergent additives determines not only the detergent properties of the finished oil, but also its ability to neutralize acids, oxidation stability and compatibility of components in the overall additive system.
As engine technology evolves and oil performance requirements increase, the chemical structure of detergent additives, base number level, metal content and formulation compatibility become important criteria in product development and raw material procurement. Understanding TypesDetergent additives, their chemical properties, applications and quality control requirements helps manufacturers optimize formulations and increase product competitiveness.
1. Chemical composition and main types of detergent additives for lubricating oils
Detergent additives for lubricating oils are usually compounds containing polar organic groups and metal components. The most common types include sulfonates, phenates, and salicylates, which typically contain metals such as calcium and magnesium.
Depending on the chemical structure and base number, detergent additives are divided into several types designed for different lubricant formulations.
1.1. Sulfonate Detergent Additives
SulfonateDetergent additiveswidely used in motor oil formulations. They are usually obtained from alkylbenzenesulfonic acids by reaction with alkaline metal compounds.
Based on the level of alkaline number, the following varieties are distinguished:
- Low alkaline calcium sulfonates:provide basic cleaning and anti-corrosion properties, as well as a certain ability to neutralize acids. They are used in oil formulations with relatively low base number requirements.
- Medium alkaline calcium sulfonates:provide a balance between detergent properties and acid neutralization ability. Used in various types of motor oils.
- High alkaline calcium sulfonates:are produced using superbasicity technology, in which an excess of an alkaline component is introduced into the system. This increases the total base number (TBN) and enhances the oil's ability to neutralize acidic products formed during engine operation.
Calcium-based sulfonate detergent additives have good oil solubility and wide compatibility with formulation components. They are widely used in motor and other lubricants of various performance categories.
1.2. Phenate Detergent Additives
Phenate detergent additives are usually obtained by reacting alkylphenols with alkaline metal compounds. They represent another important group of metal-containing detergent additives.
Main features:
- Provide cleaning properties and a certain ability to neutralize acids.
- Some phenate structures have additional antioxidant effects.
- Can be used in conjunction with sulfonates and other functional additives.
- Suitable for lubricating oil formulations that require comprehensive control of high temperature deposits and oxidation products.
When developing formulations, the choice of the type of phenates and their concentration is determined taking into account the properties of the base oil, the required base number and the composition of other additives.
1.3. Salicylate Detergent Additives
Salicylate detergent additives are usually produced on the basis of alkylsalicylic acids, followed by metallization and appropriate overbasicity technology.
Their main functional features:
- Providing cleaning properties at high temperatures.
- The presence of a certain ability to neutralize acids.
- Helps control varnish films and deposits inside the engine.
- Possibility of use in conjunction with sulfonates, phenates and other components of a comprehensive cleaning system.
Different salicylate products differ in molecular structure, metal content and base number. Their actual characteristics must be assessed during testing of finished formulations.
1.4. Differences between medium alkaline and high alkaline detergent additives
In addition to the chemical structure, the base number is one of the main criteria for the classification and selection of detergent additives.
Medium-alkaline and high-alkaline detergent additives differ in the content of alkaline components, the ability to neutralize acids and the features of use in formulations.
High-alkaline detergent additives are usually produced using superbasicity technology, in which an excess of an alkaline component is introduced into the organic metal salt system. This allows you to increase the total base number of the product.
However, a higher base number does not automatically mean better performance in all formulations. Selection must also consider metal content, detergency, deposit control and compatibility with other additives.
2. Main functions of detergent additives in lubricating oils
Detergent additives perform several important functions in lubricant formulations.
2.1. High Temperature Deposit Control
Varnish films, carbon deposits and oxidation products may form on pistons, piston rings and other engine parts operating at high temperatures.
Detergent additives, through surface adsorption, dispersing action and other chemical mechanisms, help reduce the formation of deposits on metal surfaces and maintain engine cleanliness.
2.2. Neutralization of acidic compounds
The combustion of fuel and oxidation of lubricating oil can produce acidic compounds that increase the risk of corrosion.
Highly alkaline detergent additives have a certain alkaline reserve, which allows you to neutralize some acidic products and helps control oil acidification and associated corrosion processes.
The total base number (TBN) is one of the main indicators for assessing such an alkaline reserve.
2.3. Keeping internal engine parts clean
Detergent additives help control deposit formation in high temperature zones and work in conjunction with ashless dispersants to reduce the risk of aggregation and sedimentation of insoluble contaminants.
Despite the interrelation of functions, detergent additives and dispersants are not interchangeable. The primary purpose of detergent additives is to control surface deposits and neutralize acids, while ashless dispersants are designed primarily to maintain soot and other insoluble particles in a stable dispersed state in the oil.
2.4. Additional protection against rust and corrosion
Some metal sulfonates and other detergent additives can form a protective adsorption layer on metal surfaces, helping to reduce exposure to moisture and corrosives.
The actual effectiveness of rust and corrosion protection depends on the structure of the product and the composition of the entire additive system.
3. Application of detergent additives in various types of lubricating oils
Different lubricants have different requirements for detergency, TBN and deposit control. Therefore, the choice of detergent additives must take into account specific operating conditions.
3.1. Diesel engine oils
During the operation of diesel engines, significant amounts of acidic combustion products and soot can be formed, which places increased demands on the detergent-dispersant oil system.
Detergent additives are used to solve the following problems:
- Neutralization of acid compounds formed during fuel combustion.
- Control of high-temperature deposits on the piston surface.
- Reduced formation of varnish films and carbon deposits.
- Work together with ashless dispersants to control soot and sludge.
When developing oils for diesel engines operating in harsh conditions, special attention is paid to the base number of detergent additives, metal content and stability of properties over long-term operation.
3.2. Oils for gasoline engines
Motor oils for gasoline engines must control high-temperature deposits on pistons and other internal parts while maintaining essential lubricating properties.
Detergent additives help control oxidation products and the formation of varnish films by interacting with antioxidant, dispersant and anti-wear components.
When developing such oils, the type of detergent additives and the concentration of their input must be selected taking into account the required category of operational properties and engine operating conditions.
3.3. Marine engine oils
Marine engines can operate under high load for long periods of time. Fuel sulfur content, operating temperature and operating conditions affect acid neutralization and deposit control requirements.
High alkalineDetergent additivesare usually important components of such formulations. They increase the alkaline reserve of the oil and help neutralize acidic compounds formed during fuel combustion.
The final choice depends on the type of fuel, engine design and requirements for the finished lubricant.
3.4. Industrial lubricants and other types of oils
Some industrial lubricants and specialty oils also use additives to provide detergent, anti-corrosion and acid-neutralizing properties.
Requirements for metal content, oxidative stability, deposit control and material compatibility vary depending on the application. Therefore, it is necessary to select a product taking into account the characteristics of a specific lubrication system.
4. Key factors when developing formulations with detergent additives
Developing an effective system of detergent additives for lubricating oils requires a comprehensive consideration of the chemical structure, base number, properties of the base oil and the interaction of various components of the formulation.
4.1. Total Base Number (TBN)
The total base number is an important technical indicator characterizing the alkaline reserve of detergent additives. It is usually expressed in mg KOH/g.
Products with different base numbers are designed for different lubricating oil formulations. For motor oils that have increased requirements for neutralizing acids, highly alkaline detergent additives can be considered, taking into account the characteristics of the target product.
4.2. Metal content
The content of calcium, magnesium and other metals is one of the main indicators of the composition of metal detergent additives.
This parameter affects the contribution of the additive to the formulation, the level of sulfated ash content and the performance characteristics of the finished oil.
Therefore, when choosing detergent additives, it is necessary to take into account the metal content and ash content requirements of the target lubricant.
4.3. Kinematic viscosity and product stability
The viscosity of detergent additives affects storage, transportation, dosing and technological processes for preparing recipes.
In addition, the product must have good storage stability, without significant delamination, sedimentation or other changes that could affect its use.
4.4. Compatibility of detergent additives with other components
Detergent additives are not usually used in isolation. Together with ashless dispersants, antioxidants, antiwear and other functional components, they form a comprehensive additive system.
When developing recipes, you need to check:
- Compatibility of different types of detergent additives with each other.
- Compatibility of detergent additives with ashless dispersants.
- Interaction with antioxidant and antiwear additives.
- The influence of base oil on the solubility and stability of additives.
- The stability of the finished oil during storage and its ability to control the formation of deposits.
The right combination of components helps optimize the complex characteristics of the lubricant.
5. Production of detergent additives and quality control
The quality of detergent additives depends not only on the raw materials, but also on the technology of chemical reactions, control of the production process and testing of finished products.
For example, the production of metal sulfonate detergent additives typically involves raw material preparation, a neutralization reaction, an overbasicity process, moisture removal, filtration, and quality control of the finished product.
5.1. Control of raw materials
The quality of the raw material directly affects the course of the reaction and the composition of the final product.
During the manufacturing process, key starting materials, alkali metal compounds, and other reagents must be tested to ensure they meet manufacturing requirements.
5.2. Process control
The temperature and duration of the reaction, the ratio of the starting components and mixing conditions affect the degree of reaction and the stability of the quality of the product.
In the production of superbasic detergent additives, special attention is paid to the introduction of alkaline components and the stability of the colloidal system. This reduces the risk of unwanted sediment formation and unevenness of the finished product.
5.3. Filtration and processing of the finished product
After the reaction is completed, moisture removal, filtration and other post-processing operations are carried out according to the technology. Their task is to control the content of water, mechanical impurities and insoluble substances.
5.4. Quality control of finished products
Detergent additive manufacturers typically implement comprehensive quality control procedures that include testing of every batch of product.
| Controlled indicator | Purpose of the test |
| Total Base Number (TBN) | Estimation of product alkaline reserve |
| Calcium/magnesium content | Monitoring the content of metal components |
| Kinematic viscosity | Evaluation of fluidity and stability of characteristics between batches |
| Water content | Product moisture control |
| Flash point | Assessment of basic physical characteristics and handling safety |
| Chroma | Control of appearance and changes between batches |
| Mechanical impurities | Product purity assessment |
| Storage stability | Assessment of the preservation of product properties during storage |
For lubricating oil manufacturers, consistent product quality, complete technical documentation and traceability of control results of each batch are important criteria when choosing a supplier of detergent additives.
6. Purchasing Detergent additives: how to choose a suitable supplier?
For lubricant manufacturers and purchasing professionals, choosing a detergent additive supplier should not be based solely on price or a single technical indicator. It is necessary to comprehensively evaluate product characteristics, production capabilities, quality management system and level of technical support.
6.1. Checking Product Specifications
Before purchasing, it is recommended to clarify the following parameters:
- Type of product and its chemical composition.
- Total base number (TBN) and tolerances.
- Content of calcium, magnesium and other metals.
- Kinematic viscosity and flash point.
- Content of water and mechanical impurities.
- Storage stability.
- Stability of characteristics from batch to batch.
It is also recommended that you request a Technical Data Sheet (TDS), Safety Data Sheet (SDS) and Lot Specific Certificate of Analysis (COA) from the supplier.
6.2. Assessing the supplier's production capabilities
Since detergent additives are important components of lubricating oil formulations, the stability of their supply directly affects the production plans of consumer enterprises.
When choosing a supplier, you should pay attention to production equipment, configuration of production lines, annual capacity, quality control system and reliability of raw material supply.
6.3. Technical development and formulation support
Different lubricating oil formulations place different demands on detergent additives.
A professional supplier must not only ensure the supply of products, but also help customers select suitable components and evaluate their compatibility, taking into account the type of base oil, finished product requirements and operating conditions.
6.4. Comprehensive assessment of procurement costs
When estimating purchase costs, you should consider not only the unit price, but also additive dosage, transportation costs, consistency of performance between batches, and the effect of the product on the performance properties of the finished oil.
For enterprises planning long-term cooperation, stability of quality and reliability of supply are no less important than price.
7. Development trends of detergent additives for lubricating oils
As engine technology develops, environmental requirements become more stringent and lubricant quality standards rise, detergent additives are being improved towards more precise control of the molecular structure and optimization of formulations.
7.1. Development of highly effective detergent additives
Taking into account the various operating conditions of engines, specialists continue to improve the molecular structure, base number and metal composition of detergent additives. The main objective is to improve high temperature deposit control and acid neutralization.
7.2. Development of low-ash motor oil formulations
Due to tightening requirements for the content of sulfated ash, phosphorus and sulfur in some categories of motor oils, manufacturers need to more carefully balance the content of metallic detergent additives, ashless dispersants and other functional components.
This increases the requirements for monitoring metal content and developing detergent additive formulations.
7.3. Optimization of complex additive systems
Detergent additives alone cannot satisfy all lubricating oil performance requirements.
A rational combination of sulfonates, phenates, salicylates, dispersants and antioxidant components allows the development of complex additive systems taking into account the characteristics of various applications.
7.4. Modernization of production and quality control systems
Manufacturing automation, intelligent process control, and improved testing methods help improve batch-to-batch consistency, reduce production variation, and provide more reliable supplies of raw materials to end-user businesses.
8. Detergent additives and integrated solutions for lubricant manufacturers
Lansheng (Jinzhou) Chemistry LLC specializes in the development, production and sale of lubricant additives. The company strives to provide domestic and foreign oil manufacturers with a stable supply of products and professional technical support.
The company was founded in April 2018. The production base covers approximately 46,667 m² and is equipped with five production lines. The annual production capacity is 60,000 tons. The range includes detergent additives, ashless dispersants, additive packages and other functional components intended for the development and production of various lubricants.
In the field of research and production, the company has a team of 9 R&D specialists and 12 engineering and technical specialists. The company is consistently developing new products, improving production processes and optimizing recipes. A closed production cycle and intelligent process control systems make it possible to control key technological parameters and maintain stable product quality.
Taking into account the needs of various customers, the company provides product selection recommendations, technical documentation and formulation adaptation support, helping lubricant manufacturers optimize the detergent additive system and the overall combination of functional components.
Selecting the appropriate detergent additives requires evaluating not only individual technical characteristics, but also the molecular structure of the product, its compatibility with the formulation, and the supplier's ability to provide long-term cooperation.
If you are looking for sulfonate, phenate, salicylate or other typesDetergent additives, contact Lansheng (Jinzhou) Chemistry LLC to obtain information about our products, technical specifications and delivery conditions. We are available to discuss solutions to suit your lubricating oil formulation requirements.
