Engineered for high load-carrying capacity, superior thermal stability, and extended machinery lifespan.
Established in 2009 and headquartered in Zibo, Shandong, Shandong Longhai Lubrication Technology Development Co., Ltd. is a high-tech enterprise integrating research and development, smart manufacturing, and global sales. For over 15 years, we have worked on lubricant chemistry, refining industrial gear protection with our proprietary brand "Century Longhai" and strategic cooperation brand "A Ba" series. Our industrial footprint covers an extensive catalog including diesel engine oil, gasoline engine oil, gear oil, hydraulic transmission fluid, anti-wear hydraulic oil, special engineering machinery oils, and motorcycle specialty formulations.
We are backed by PICC China People's Insurance Company, ensuring that our technical operations are secure and our quality guarantees are concrete. By introducing advanced formulation processes and testing protocols, we make sure that our gear oils maintain viscosity stability, provide anti-oxidation barriers, and protect gears under severe operating conditions.
An in-depth analysis of tribological parameters, formulation engineering, and global supply chain dynamics.
Industrial machinery operates under increasingly harsh conditions. Power density requirements have forced gearbox designs to shrink in size while handling higher torques. This puts heavy stress on tooth interfaces, leading to potential surface fatigue, micro-pitting, and thermal breakdown of the lubricant film.
Our Activa Gear Oil formulations are engineered to address these operational shifts. The trend is clear: moving away from traditional mineral-based lubricants toward highly refined Group II hydrocracked and Group III/IV (PAO) synthetic base oils. By optimizing the molecular structure of the base fluid, Activa Gear Oil maintains a stable viscosity index across wide temperature ranges, minimizing cold-start drag while preventing metal-to-metal contact at operating temperatures exceeding 100°C.
Procurement teams at international plants no longer view lubricants simply as a consumable commodity. They treat lubricants as a critical mechanical component that directly affects Total Cost of Ownership (TCO). Procurement managers look for specific properties to maximize their returns:
At Shandong Longhai’s 131-acre manufacturing center, we have integrated Factory 4.0 technologies to secure supply chain stability and high product quality. Traditional blending processes can introduce human error and variation between batches. Our smart production facility changes that:
Our blending lines feature automatic mass-flow metering systems and computerized temperature controls, ensuring that base oils and additive packages are introduced in precise ratios. Our automatic filling lines utilize high-precision volumetric meters that achieve a filling accuracy of 1‰ to 2‰. This precision prevents product loss and ensures weight accuracy, while increasing filling speeds by 20% to 35%. This speed boost helps us fulfill large-scale global orders quickly and reliably.
Our on-site research center is equipped with advanced testing instruments, including inductively coupled plasma (ICP) spectrometers, gas chromatographs, and automatic kinematic viscometers. Every batch of Century Longhai and Activa Gear Oil undergoes a strict quality control sequence before leaving the facility, checking metrics like dynamic viscosity, flash point, pour point, water separation capacity (demulsibility), and copper strip corrosion resistance.
Quality assurance verified by international standard organizations and leading automotive manufacturer approvals.
Shandong Longhai Lubrication Technology Development Co., Ltd. operates under strict quality, environmental, and occupational safety frameworks. We have obtained ISO 9001:2015, ISO 14001, and ISO 18001 certifications. Our automatic transmission formulations have received official Mercedes-Benz approvals, demonstrating our capacity to meet precise OEM requirements.
From custom viscosity adjustments to private-label packaging designs, we offer complete support for global brand owners.
We develop synthetic and semi-synthetic lubricant blends tailored to specific operating speeds, temperatures, load requirements, and regional environmental standards.
Our facility easily adjusts to accommodate various order sizes, from small specialized trial batches to high-volume commercial production runs.
We provide full documentation, product certifications, safety data sheets (SDS), and custom packaging design to build your brand value.
Demand Analysis
Evaluate mechanical loads, operational temperatures, and base fluid specifications.
Formula Development
Select base oils and additive packages in our laboratory.
Sample Testing
Verify performance under simulated extreme operating conditions.
Production & Delivery
Blend and fill orders using our automated Factory 4.0 production lines.
After-Sales Support
Provide technical consulting, fluid analysis, and logistics coordination.
How our industrial and automotive lubricants protect equipment across heavy industries globally.
Get answers to technical questions about gear oil formulations, specifications, and performance optimization.
The primary difference lies in their load-carrying capacity and performance under extreme conditions. L-CKC gear oils are formulated for medium-load industrial closed gear transmission systems. L-CKD oils are designed for heavy-duty industrial closed gear systems operating under continuous high loads, high temperatures, and severe shock loading. L-CKD formulations provide superior anti-wear, anti-micro-pitting, and thermal oxidation stability, which helps extend machinery service life compared to L-CKC oils.
Activa Gear Oil formulations use high-viscosity-index synthetic base oils (Group III or synthetic PAO mixtures) that minimize internal fluid friction, or viscous drag. By reducing traction coefficients within the gear tooth meshing zone and decreasing churn losses, the gear oil minimizes power dissipation. In field tests, this translates to measurable reductions of 1.5% to 3.0% in electric current draw across industrial conveyor drives, extruders, and planetary gear systems.
Under heavy loads, high torque, or sudden shock loading, the lubricating film can thin out, bringing gear tooth faces into contact. Sulfur-phosphorus EP additives react chemically with iron surfaces at local contact points to form a protective, low-shear-strength metal sulfide/phosphide barrier film. This film prevents scuffing, welding, and catastrophic adhesive wear, preserving gear profiles and preventing mechanical failures.
Our manufacturing center utilizes automated PLC-controlled blending lines and high-precision mass flowmeters that measure raw inputs with an accuracy of 1‰ to 2‰. Combined with on-site laboratory testing, this automated control ensures that every batch matches our target specifications. This setup minimizes human error and guarantees consistent product properties, which is crucial for international B2B clients who rely on steady chemical performance.
Our products are engineered to meet strict international standards, including API, ACEA, DIN, and ISO specifications. Our automatic transmission formulations have received formal Mercedes-Benz approvals, demonstrating our capacity to manufacture lubricants that meet the tight performance requirements of major global OEMs.
Industrial lubricants, heavy-duty engine protection fluids, and specialized transport gear oils.
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