Explore our premium grade heavy-duty motor, gear, and industrial fluids tailored for extreme operational environments.
Differentials are among the most highly stressed mechanical components in automotive powertrains and industrial heavy machinery. As torque requirements swell across global logistics, shipping, construction, and mining industries, the demand for high-performance differential gear oils has reached unprecedented heights.
Traditional mineral gear oils struggle under modern extreme-pressure (EP) operational parameters. Hypoid gear designs, common in heavy-duty differentials, experience a high level of sliding friction in addition to rolling contact. Under these circumstances, standard lubrication fails, leading to micro-pitting, gear scoring, and eventual catastrophic failure.
In response, global supply chains have shifted toward high-viscosity synthetic formulations (Group III, Group IV PAO, and ester-based lubricants) that integrate specialized sulfur-phosphorus EP additives. These additives thermally decompose in high-load areas to form a resilient protective surface film, safeguarding components even under extreme shear loads.
Modern differential lubricants must manage four critical zones: hydrodynamic lubrication, mixed boundary lubrication, thermal oxidation resistance, and fluid shear stability. When heavy vehicles negotiate turns, shock-loading occurs in the diff-lock assemblies, requiring instant anti-scuffing activation.
By using advanced sulfur-phosphorus chemistry, our gear oils form a tribochemical sacrificial layer on the teeth of hypoid gears. This layer reduces friction coefficients, prevents welding, and maintains operational stability from cold starts at -40°C to continuous operating temperatures of 150°C.
Additionally, the rise of electric vehicles (EVs) introduces new requirements for differential fluids. High-input motor speeds (up to 20,000 RPM) require excellent cooling capabilities, copper compatibility, and electrical conductivity control, steering the market toward next-generation ultra-low viscosity synthetic axle fluids.
Established in 2009 and headquartered in Zibo, Shandong, Shandong Longhai Lubrication Technology Development Co., Ltd. is a high-tech enterprise integrating research & development, production, and international sales. With over 15 years of industry experience, we operate a fully vertically integrated industrial chain, supplying premium-grade lubricants to industrial and automotive sectors worldwide.
We own our flagship domestic brand "Century Longhai" alongside our international strategic partner brand, the British "A Ba" series. Our comprehensive product portfolio spans diesel engine oil, gasoline engine oil, heavy-duty gear oil, hydraulic transmission oil, anti-wear hydraulic oil, specialized engineering machinery fluid, natural gas engine oil, synthetics, automotive urea solution, antifreeze, and industrial specialty fluids.
Every drop of oil produced is backed by a product quality liability insurance policy issued by the PICC (People's Insurance Company of China), providing peace of mind to our distributors and commercial partners worldwide.
Years of R&D Experience
Annual Production Capacity
Cities Covered Globally
Annual Revenue R&D Investment
Operating out of Zibo, Shandong's chemical industry hub, Longhai offers world-class production speeds, quality control, and cost efficiency.
Our blending lines feature automatic PLC systems to measure temperatures and flow. This ensures base oil and additive ratios remain consistent between batches, minimizing human error.
Utilizing high-speed metering filling technology, our automated packaging lines maintain an accuracy tolerance of 1‰-2‰, while boosting filling speeds by 20% to 35% compared to conventional processes.
Located near major marine shipping routes and raw material supplies in Shandong, we secure premium base oils and high-performance additives globally, passing the savings to our wholesale partners.
Longhai operates under strict international standards to ensure reliability, environmental compliance, and safety.
Longhai Technology has passed the rigorous requirements for ISO 9001:2015 Quality Management System, ISO 14001 Environmental Management System, and OHSAS 18001 Occupational Health and Safety Management System. Our specialized fluids have also obtained official OEM approvals, including automatic transmission approvals from Mercedes-Benz.
By blending advanced refining technologies with strict laboratory inspection gates, we ensure our gear oils, engine oils, and industrial fluids maintain performance under heavy shear, high heat, and heavy dust environments.
From tailor-made additive packages to customized branding, we provide a complete solution for global distributors.
Our engineers formulate custom gear oils and engine lubricants to meet regional temperature ranges, load profiles, and target pricing, ensuring compliance with API, ACEA, and specific OEM standards.
Whether you require synthetic gear oil for low-temperature operations in northern logistics corridors or high-viscosity mineral oils for heavy-duty mining machinery in tropical climates, our laboratory develops, tests, and certifies the formulation for your market.
Our step-by-step process ensures transparency, product quality, and reliable delivery for global wholesale buyers.
Defining application details, viscosity grades, container sizes, and order volumes.
Designing the fluid formulation with specific base oils and additives to meet target specifications.
Performing shear, oxidation stability, and extreme pressure testing in our facility.
Executing automated blending, precision filling, and packaging under strict quality control.
Managing container transport, customs documentation, and after-sales oil analysis support.
Formulated to withstand extreme environments, our gear oils keep machinery running reliably worldwide.
Excavators, wheel loaders, and dump trucks operate under slow speeds and heavy shock loads. Our GL-5 gear oils form a robust sulfur-phosphorus barrier to protect gears from scuffing and pitting.
For long-haul logistics fleets, fuel efficiency and extended drain intervals are critical. Our fully synthetic differential lubricants reduce internal fluid friction, helping to improve fleet fuel economy.
Harvesters and tractors face high levels of dirt, dust, and water exposure. Our formulations prevent sludge buildup and rust formation, maintaining film strength under hot, humid operating conditions.
Get answers to common technical and procurement questions from our lubricant specialists.
API GL-5 oils contain up to twice the concentration of extreme-pressure (EP) additives compared to GL-4 oils. This makes GL-5 ideal for hypoid gear differentials in passenger cars and heavy trucks. However, they should not be used in gearboxes with yellow-metal (bronze/copper) synchronizers, as the sulfur-phosphorus compounds can corrode those components unless specific buffers are added.
Limited-slip differentials rely on clutch plates to allocate torque between tires. Without friction modifiers, the plates can chatter and slip unevenly. Our specialized LSD formulations contain friction-reducing agents that ensure smooth clutch engagement, reducing wear and operational noise.
We utilize automated blending systems monitored by real-time viscosity and density meters. Every production run undergoes laboratory testing for ASTM/API compliance before packaging and shipping, ensuring consistent performance for every batch.
We supply lubricants in standard 1-liter, 4-liter, and 18-liter pails, as well as 200-liter steel drums for industrial and workshop use. Custom container sizes and designs are also available through our OEM/ODM division.
Take a look inside Shandong Longhai's modern production facilities and testing laboratories.
Explore our industrial gear, compressor, refrigeration, and heavy hydraulic system fluids.
Explore our industrial verification certificates and field testing records across the globe.
Partner with a reliable manufacturer of high-performance differential gear oils and industrial fluids. We welcome OEM/ODM inquiries and wholesale distribution partnerships worldwide.
Our business philosophy centers on: "Dare to explore, innovate continuously, survive by quality, and promote development by efficiency." Let's work together to lubricate the future.
Factory Address: Zibo, Shandong Province, China
Annual Blending Capacity: 200,000 Tons
Certifications: ISO 9001, ISO 14001, OHSAS 18001
Longhai
