Explore our foundational range of certified lubricants manufactured under strict quality standards for heavy-duty fleet operations, automotive applications, and machinery protection.
A Professional White Paper on Heavy-Duty Automotive Lubricant Technology, Efficiency Standards, and Supply Chain Integrity
The modern differential operates under some of the most punishing mechanical environments in commercial vehicles. Heavy-duty trucks transport payloads scaling up to 40+ metric tons, subjecting final drives and hypoid gears to extreme sliding pressures and elevated operational temperatures. The critical interface between gear teeth requires specialized boundary and elastohydrodynamic lubrication, rendering differential oil selection a fundamental operational factor.
Truck differential oil, primarily formulated to meet API GL-5 or specialized OEM specs, relies on customized sulfur-phosphorus extreme-pressure (EP) additives. These additives chemically react with iron surfaces under thermal stress to produce a sacrificial protective layer, preventing welding, micro-pitting, and rapid wear. Selecting an inadequate grade or utilizing degraded lubricant results in rapid carrier bearing wear, ring and pinion pitting, and catastrophic differential lockups—leading to expensive fleet downtime.
As heavy machinery demands increased efficiency, global operations are transitioning from conventional mineral oils to highly refined synthetic formulas. Our chemical engineering team balances base-oil viscosity indexes with advanced shear-stable viscosity modifiers to guarantee fluid flow under low temperature startups, while preserving oil-film thickness under scorching desert hauls.
Optimized sulfur-phosphorus configurations form robust anti-welding barriers on high-sliding gear meshes, securing smooth torque transitions under peak shocks.
Superb oxidation stability prevents sludge synthesis and fluid breakdown, expanding drain parameters from standard 50,000 km to over 100,000 km.
Exceptional shear-resistant formulation properties maintain target film thicknesses at elevated temperatures, preventing metal-to-metal friction.
Advanced Blending Infrastructure, Automated Precision, and Global Export Logistics from Zibo, Shandong
Shandong Longhai Lubrication Technology Development Co., Ltd., founded in 2009 in Zibo, Shandong Province, sits at the heart of China's heavy chemical and manufacturing corridor. By optimizing localized supply logistics for premium base stocks (Group I, II, III and Synthetic PAO) and direct supply-line links for international additive systems, we have constructed a globally competitive manufacturing footprint.
Our production complex occupies 131 acres, achieving an annual manufacturing output capacity of 200,000 metric tons. Equipped with modern intelligent production lines and fully automated blending cells, we reduce manual steps and human error. Our filling systems run on high-precision volumetric and mass-flow principles, achieving a filling precision of 1‰-2‰.
By automating the line packaging process, Shandong Longhai has accelerated our throughput rates by 20% to 35% relative to legacy facilities. This production speed allows us to fulfill large container orders (FCL) quickly, ensuring that procurement managers meet target logistics windows and avoid costly distribution bottlenecks.
Solving Wear Issues Across Global Climates and Addressing Green Energy Demands
Operating in high-dust and extreme payload regions requires robust protection. Our heavy-duty differential oil delivers premium surface film defense to hypoid gearboxes operating at slow speeds and extreme torques.
Conventional gear oils thicken rapidly in sub-zero winters, causing dry wear during startup. Shandong Longhai's high viscosity index fluids maintain fluid mobility down to -40°C, ensuring instant components defense.
Express fleets need stable oils that survive high-speed highway cruising. Our thermal-oxidation resistant formulations prevent base oil volatility, maintaining stable oil film strength over transcontinental trips.
Modern transport focuses heavily on lower emissions and improved fuel economy. Modern low-viscosity gear lubricants minimize churning losses inside the axle housing, cutting fleet fuel consumption by up to 1.5%.
With electric trucks delivering maximum torque instantly, differential gear assemblies face increased shear stress. Our synthetic fluids are optimized for electrical compatibility and thermal insulation.
Mixed fleets utilize machinery from various global OEMs. We develop versatile fluids that fulfill requirements for Dana, Meritor, Volvo, ZF, and Scania gearboxes, simplifying inventory management.
Custom Formulations and Packaging Engineered for Global Fluid Brand Owners
Longhai Technology operates a complete industrial chain system. We offer partners tailored services to support custom lubricant designs for regional climates, severe duty applications, or local price targets. Our standard brand line includes the recognized "Century Longhai" alongside the international strategic cooperation brand British "A Ba" series of products. Our product catalog covers diesel engine oil, gasoline engine oil, gear oil, hydraulic transmission oil, anti-wear hydraulic oil, special engine oil for engineering machinery, special oil for natural gas, full synthetic oil, automotive urea solution, antifreeze, special engine oil for motorcycles, industrial oil, automatic transmission oil and many other lubricant varieties. Importantly, all brand series are insured by the PICC China People's Insurance Company, providing peace of mind to buyers.
We work closely with global chemical institutions and testing centers to match required certifications (API, IATF 16949, and OEM approvals). Our in-house research laboratory tests every production run, verifying viscosity index (VI), copper strip corrosion parameters, four-ball wear scar diameter, and low-temperature Brookfield viscosity to guarantee batch-to-batch quality consistency.
Our commitment to quality is validated by international regulatory bodies and industry audits
Shandong Longhai Technology Development Co., Ltd. builds and maintains a comprehensive quality management structure to protect our client supply chains. Our operations have successfully passed ISO 9001:2015 Quality Management System certification, ISO 14001:2015 Environmental Management System certification, and ISO 45001:2018 Health & Safety Management System certification. Furthermore, our automatic transmission lubricants have received official Mercedes-Benz approvals, ensuring our systems comply with demanding global OEM specifications.
We source high-purity additives from global tier-one suppliers (Lubrizol, Infineum, Afton Chemical, Chevron Oronite) and utilize modern production systems to ensure that exported products resist high-temperature degradation, protect final gears from heavy-load pitting, and support extended drain intervals.
A tour of our production facility, research laboratory, and storage facilities in Zibo, Shandong
Enterprise environment
Laboratory equipment
Joint innovation center
Enterprise environment
Laboratory equipment
Joint innovation center
Key technical insights on truck differential lubricants, performance specs, and sourcing practices.
API GL-4 and GL-5 designations are based on the load-carrying capacity of the lubricant and their concentration of Extreme Pressure (EP) additives. API GL-4 oils are designed for moderate gear loads, typically containing around 2% to 3% EP chemical additives. They are common in manual transmissions with brass synchronizers, which can suffer corrosion from excessive sulfur-phosphorus compounds.
Conversely, API GL-5 gear lubricants are designed for severe operating conditions, such as truck differentials and final hypoid gearboxes. They typically contain 5% to 6.5% EP additives. Hypoid gears experience severe sliding action under load, necessitating the high EP concentration of a GL-5 fluid to prevent gear tooth wear. Always check your OEM manual; using a GL-4 fluid in a high-pressure hypoid differential will lead to rapid tooth scoring and gearbox failure.
Brookfield Viscosity at -40°C measures the low-temperature internal fluid friction of an oil under low-shear startup conditions. In cold regions like Northern Europe, Russia, and Canada, heavy trucks frequently start in temperatures below -30°C. If the differential oil is too thick, the oil pump or splash system cannot distribute it effectively, leaving the pinion gears to run dry during the initial operating minutes.
A low Brookfield viscosity (for example, below 150,000 mPa.s at -40°C for a synthetic 75W-90) ensures that the oil flows quickly to gear teeth interfaces upon startup, preventing scoring and reducing drag to support fuel efficiency during warm-up periods.
Yes, we specialize in high-viscosity, heavy-duty formulations designed for extreme off-highway applications. Mining trucks operate at low speeds under high torque, which thins out the lubricant oil film. We formulate custom heavy-duty oils (such as SAE 85W-140 or specialized synthetic equivalents) with elevated concentrations of shear-stable tackifiers and polymer thickeners. This ensures the fluid maintains a thick film under extreme pressures, protecting gears from impact loads and high-dust abrasive conditions.
Our quality management is governed by our ISO 9001:2015 and Mercedes-Benz system approvals. We implement a three-tiered quality control workflow:
1. Incoming base stocks and chemical additives are verified for purity before entering our storage tanks.
2. Production runs are continuously monitored on our automated lines, with in-process sampling to check kinematic viscosity, density, and flashpoint parameters.
3. Every production batch is archived with retaining samples, and independent laboratory COA (Certificate of Analysis) reports are provided to our clients before container dispatch.
Advanced transmission, hydraulic, and diesel system oils optimized for long service life and high efficiency.
Get in touch with our team of experts for customized formulations, global pricing, and technical advice.
Shandong Longhai Lubrication Technology Development Co., Ltd. is committed to helping global fleet operators, industrial plants, and retail distributors secure reliable driveline lubricants.
Our philosophy is built on technical expertise, stable batch production, and reliable logistics integration. Whether you require standard bulk export (1-liter bottles, 4-liter bottles, 18-liter pails, or 200-liter steel drums) or a custom formulation designed for extreme environments, we are ready to assist.
Shandong Longhai Lubrication Technology Development Co., Ltd.
Headquarters: Zibo, Shandong Province, China
Longhai
