Premium grade oils and fluids engineered for optimal mechanical protection, shear stability, and heat dissipation.
Industrial machinery operates under extreme stress, with gear systems transmitting thousands of kilowatts of energy in demanding environments. Standard lubricants quickly fail under extreme shear, high operating temperatures, and moisture exposure. This leads to micropitting, component wear, and unexpected system downtime.
As a leading Chinese manufacturer of machine gear oil, Shandong Longhai Lubrication Technology Development Co., Ltd. formulates heavy-duty gear oils that provide a protective chemical barrier. Utilizing sulfur-phosphorus extreme pressure (EP) additives and high-viscosity index base fluids, our products protect gears and bearings from premature failure while optimizing operational efficiency.
A trusted global lubrication enterprise integrating R&D, precision manufacturing, and strategic application support.
Established in 2009 and headquartered in Zibo, Shandong, Shandong Longhai Lubrication Technology Development Co., Ltd. has been a pioneer in advanced lubrication for over 15 years. Located in Shandong’s petrochemical corridor, we have built a fully integrated supply chain that spans custom molecular formulation to automated packaging and global distribution.
Under our proprietary brand "Century Longhai" and through international strategic cooperation with the British "A Ba" series, we deliver high-performance diesel engine oils, gasoline engine oils, industrial gear oils, hydraulic transmission fluids, compressor oils, and specialized automotive solutions. Our commitment to quality is backed by comprehensive coverage from the People's Insurance Company of China (PICC), providing long-term reliability and operational security for industrial users worldwide.
Understanding the molecular properties and applications of medium-load vs. heavy-duty lubricants.
Industrial transmissions operate under varying thermal loads, speeds, and forces. To prevent mechanical failure, gear oils must be formulated according to load profiles. Shandong Longhai manufactures gear oils designed to meet the operational demands of heavy machinery:
| Property / Classification | L-CKC Medium-Load Industrial Gear Oil | L-CKD Heavy-Duty Industrial Gear Oil |
|---|---|---|
| Load Profile | Medium contact stress (<1000 MPa) | Extreme contact stress (>1000 MPa) |
| Extreme Pressure Additives | Sulfur-Phosphorus EP chemistry | High-concentration active sulfur-phosphorus package |
| Operating Viscosities (ISO VG) | 100, 150, 220, 320, 460 | 150, 220, 320, 460, 680, 1000 |
| Thermal & Oxidation Stability | Standard industrial range (up to 90°C) | Advanced thermal stability (up to 120°C continuous) |
| Micropitting Resistance | Moderate resistance for standard gears | High-performance protection against micro-fatigue wear |
| Primary Application Fields | Light metallurgy, conveyors, general manufacturing | Heavy steel roll mills, cement kilns, wind turbines |
Providing high-volume, precision-blended lubricants with short lead times and global shipping reliability.
Our manufacturing plant uses automated metering systems to measure additives and base oils. This process guarantees a filling accuracy threshold of 1‰ to 2‰, maintaining product consistency across production batches.
Through process automation, we have increased production line speeds by 20% to 35%. This enables us to fulfill high-volume OEM/ODM orders while keeping lead times short for our global partners.
Our location in Zibo, Shandong provides direct access to high-quality base oils (Group I, II, III and synthetics) and chemical raw materials. This proximity helps insulate our manufacturing process from supply chain disruptions.
Tailored lubrication performance across wind energy, heavy metallurgy, cement production, and mining sectors.
Wind turbine gearboxes operate in high-altitude environments characterized by wide temperature fluctuations, high vibration, and mechanical loads. Longhai synthetic gear oils prevent micropitting on gear teeth and bearing surfaces under these conditions. Our formulations offer water separation (demulsibility) and high shear stability, which helps extend oil drain intervals and reduce maintenance costs for wind farms.
Steel processing plants subject gears to high temperatures, heavy loads, and water spray. Longhai L-CKD heavy-duty gear oil is formulated to resist thermal breakdown and oxidation under these conditions. It maintains a stable lubricating film that protects gears from metal-on-metal contact and corrosive wear.
Mining operations run continuously in dusty, abrasive, and high-impact environments. Our heavy-duty lubricants are designed to resist contamination by airborne particulate matter. They form a robust fluid film that cushions gear meshes against shock loads, helping prevent pitting, scoring, and sudden gear failures.
Cement manufacturing utilizes slow-speed, high-torque rotary kilns that require consistent lubricating film strength at high operating temperatures. Longhai's high-viscosity gear oils (ISO VG 460 and 680) are engineered to prevent adhesive wear on large girth gears, extending equipment life under continuous load.
Developing sustainable, high-efficiency lubrication technologies to meet next-generation industrial demands.
We are developing low-viscosity, high-thermal-conductivity fluids designed for electric vehicle drivetrains and high-speed industrial electric motors. These lubricants provide cooling and electrical compatibility while protecting gears from high-speed wear.
To support environmental sustainability, our R&D team is formulating synthetic ester-based biodegradable lubricants. These eco-friendly fluids are designed for use in sensitive areas, such as marine, forestry, and agricultural applications, without compromising mechanical performance.
Our upcoming product lines are designed to integrate with IoT sensor technology. This enables operators to track oil temperature, viscosity changes, and moisture levels in real-time, helping transition maintenance programs from reactive to predictive.
Adhering to strict international standards to ensure quality and compatibility in all industrial applications.
At Shandong Longhai, we follow international quality control standards. Our manufacturing facilities are certified under ISO 9001:2015 for quality management systems, ISO 14001 for environmental management, and ISO 45001 (formerly 18001) for occupational health and safety. Our automatic transmission fluids carry official Mercedes-Benz approvals, validating our performance in high-precision, demanding automotive applications.
We work with international additive houses and test our raw materials and finished products against ASTM and DIN standards. This quality control ensures that our lubricants perform under extreme operating conditions, helping customers reduce unexpected downtime and lower machinery maintenance costs.
A structured, end-to-end engineering process to develop custom lubrication formulations for global markets.
Our technical team analyzes your machinery operating parameters, load characteristics, thermal ranges, and local environmental compliance needs.
We select appropriate base stocks (Group II/III/Synthetics) and compound specific extreme pressure (EP) and anti-wear additive packages.
We test formulation performance in our Zibo laboratory, evaluating viscosity characteristics, foam tendency, demulsibility, and wear scar diameters.
Once validated, we schedule automated blending and filling on our smart production lines, using automated weight control to maintain quality.
We provide after-sales service, including used oil analysis and technical support to monitor lubricant performance and support your operations.
Get professional answers from Longhai's tribology team regarding gear oil selection, maintenance, and technical compliance.
L-CKC and L-CKD gear oils differ in load carrying capability. L-CKC is formulated for medium-load industrial gear drives with contact stresses under 1000 MPa. L-CKD is designed for heavy-duty systems operating under continuous high stress (above 1000 MPa) and shock loads. L-CKD features higher levels of extreme pressure (EP) additives and offers improved thermal stability and micropitting resistance.
Demulsibility refers to the oil's ability to separate from water. In applications exposed to moisture or condensation, water can mix with the oil, leading to emulsion formation, loss of film strength, and rust. Highly demulsible gear oil separates water quickly, allowing it to be drained off. This maintains the lubricating film and helps protect components from corrosion.
Heavy-duty gear teeth apply high shear forces to the lubricant. If the oil lacks sufficient shear stability, its viscosity index improvers break down, causing the oil to thin. This reduces film thickness and can lead to metal-on-metal contact. Longhai gear oils are formulated to maintain viscosity under high shear conditions to protect gear components.
Yes. Through our OEM/ODM service, our laboratory develops custom formulations to match specific operating conditions. This includes adjustments for extreme low-temperature fluidities, custom viscosity grades, enhanced oxidation inhibitors, or specialized compatibility requirements.
Our manufacturing plant uses automated metering systems to measure additives and base oils, maintaining a filling accuracy within a 1‰ to 2‰ threshold. Every batch undergoes laboratory validation—including viscosity index, flash point, and pour point testing—before packaging and shipment to ensure consistency with our technical specifications.
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