Technical Hub

Lubricant standards, terminology, and application guidance

Structured technical reference covering lubricant fundamentals, industry standards, specification terminology, and operating considerations for industrial and mobile equipment applications in the United Kingdom and Europe.

This Technical Hub is Sinopec Online's structured reference library for lubricant terminology, standards, and application guidance for industrial and mobile equipment across the United Kingdom and Europe.

It is written for engineers, maintenance professionals, fleet operators, and technical buyers who need to interpret specifications, compare requirements, and understand how performance language is used in service documentation and procurement.

Guidance focuses on how requirements are defined and applied in practice, including viscosity selection, operating conditions, contamination control, materials compatibility, and standards and test methods commonly referenced in technical data sheets.

This resource is educational and technical. For critical or safety-related applications, always confirm requirements against the equipment manufacturer's current service documentation before implementing changes.

Sinopec Online Technical Team
For product selection support, contact Sinopec Online or call +44 020 8068 3444.

Lubricant Terminology and Standards

Definitions and reference terms used in lubricant documentation, including abbreviations, specification language, performance terminology, and common technical phrases. Designed to support consistent interpretation of technical data sheets and maintenance documentation.

Lubricant Test Methods and Classification Standards

How lubricant properties are measured, classified, and referenced in technical documentation

ISO and DIN Lubricant Standards Reference

How ISO viscosity grades and DIN classifications are defined and referenced in lubricant specifications and technical documentation
ASTM Test Methods Overview

Overview of common ASTM test methods for measuring lubricant physical and chemical properties
Lubricant Test Methods Technical Reference

Reference guide for how lubricant properties are measured, classified, and referenced in technical documentation, including the relationship between test methods and published specifications

Hydraulic Systems

Technical guidance for hydraulic oil selection and operation, including viscosity grade selection, temperature and load considerations, filtration and cleanliness, air release and foaming control, water separation, and specification alignment.

Hydraulic Fluid Functions and Properties

What hydraulic fluids do and which properties affect system behaviour
Hydraulic System Fundamentals

How hydraulic systems operate and how fluid properties influence performance
Hydraulic Oil Viscosity Selection Explained

Choosing the correct viscosity grade for operating conditions
ISO VG Grades in Hydraulic Systems

What ISO VG numbers mean and how they are applied
Hydraulic Oil Performance Categories Explained

Understanding performance classifications used in hydraulic oils
Hydraulic System Operating Conditions and Fluid Selection

Matching fluid characteristics to temperature, load, and duty cycle
Hydraulic System Contamination and Fluid Condition

Managing cleanliness, contamination sources, and fluid degradation
Hydraulic System Standards and Documentation Interpretation

How to read ISO, DIN, ASTM, and OEM hydraulic specifications

Common Hydraulic Oil Grades

ISO VG 32 Hydraulic Oil

Typical applications, operating ranges, and specification context
ISO VG 46 Hydraulic Oil

Common use cases and temperature considerations
ISO VG 68 Hydraulic Oil

Higher viscosity applications and load conditions
ISO VG 100 Hydraulic Oil

High load and elevated temperature hydraulic systems

Diesel Engine Oil

Reference guide for heavy-duty diesel engine oil viscosity grades and performance categories, including how requirements are written, how to read common specification language, and what to confirm before selecting an oil for fleet service.

Diesel Engine Fundamentals

Overview of diesel engine operating principles and how engine design and duty cycles influence lubrication requirements
Diesel Engine Oil Functions and Properties

How diesel engine oils lubricate, protect, cool, and control contamination in service
Diesel Engine Oil Viscosity Grades Explained

How viscosity grades affect cold starts, protection, fuel economy, and high-temperature performance
Diesel Engine Oil Performance Categories Explained

How diesel engine oil performance categories define protection levels and service capability
Diesel Engine Oil Specifications and Approvals

Diesel Engine Oil Specifications and Approvals
Diesel Engine Oil Additives and Formulation

Diesel engine operating principles and their impact on lubrication requirements
Diesel Engine Oil Drain Intervals and Service Considerations

How operating conditions and service factors influence diesel engine oil drain intervals
Diesel Engine Oil Storage, Handling, and Contamination Control

Best practice for storing, handling, and protecting diesel engine oil from contamination

Common Diesel Engine OIl Grades

Automotive Gear Oil

Reference guide for automotive gear oil viscosity grades, axle and transmission performance categories, including how specifications are written, how to interpret common approval language, and what to confirm before selecting a lubricant for passenger vehicles, commercial fleets, and severe-duty driveline service.

Automotive Gear Oil Fundamentals

Overview of drivetrain operation and lubrication requirements
Automotive Gear Oil Functions and Properties

How gear oils lubricate, protect, cool, and control wear
Automotive Gear Oil Drain Intervals and Service Considerations

How operating conditions influence gear oil drain intervals
Automotive Gear Oil Storage, Handling, and Contamination Control

Best practice for storing and handling automotive gear oils
API GL-4 vs GL-5 Gear Oils

Differences between GL-4 and GL-5 gear oil performance categories
Hypoid Gear Lubrication Explained

How hypoid gears operate and why they require EP gear oils
Limited-Slip Differential Lubrication

How limited-slip differentials operate and why friction modifiers are required
SAE J306 Viscosity Classification

How SAE gear oil viscosity grades are defined and classified.

Common Automotive Gear Oil Grades

Industrial Gear Oil

Technical reference guide for industrial gear oil viscosity grades, EP performance classifications, gearbox operating conditions, contamination control practices, and specification interpretation used across enclosed industrial power transmission systems.

Industrial Gear Oil Fundamentals

Lubrication principles and reliability considerations for industrial gear systems
Industrial Gear Oil Viscosity Selection

Viscosity selection principles for industrial gearbox operating conditions
EP Additives in Industrial Gear Oils

EP protection and load carrying performance in industrial gear systems
Industrial Gear Oil Contamination Control

Contamination control and lubricant cleanliness in industrial gear systems
Micropitting and Surface Fatigue in Gear Systems

Micropitting mechanisms and surface-fatigue behaviour in gear systems
Industrial Gear Oil Oxidation and Thermal Stability

Oxidation control and thermal-stability behaviour in industrial gear oils
Industrial Gear Oil Functions and Properties

Functions and operating properties of industrial gear oils
Industrial Gear Oil Specifications and Standards

Industrial gear-oil standards, specifications, and approval frameworks

Common Industrial Gear Oil Grades

Technical Transition Guides

Application-focused summaries for reviewing an existing lubricant requirement against a proposed alternative, covering what must match, what can vary, and what should be verified in manufacturer documentation before a change is made.

Applied Lubricant Questions

Question-led technical pages addressing common lubrication decisions encountered in service, maintenance, and specification review.

Hydraulic Oils

Engine Oils

Last reviewed: 1 April 2026
Prepared by the Sinopec Online Technical Team.