Explore our heavy-duty motor oils, synthetic diesel blends, and specialty transmission fluids designed for extreme operating conditions.
In high-speed, light-to-moderate load industrial gearboxes and modern automotive transaxles, the selection of the correct gear lubricant is critical to energy transfer efficiency and component lifetime. Light gear oil (typically ranging from ISO VG 32 to ISO VG 100, or SAE 75W-80 and 75W-90) is formulated to operate under varying thermal regimes while minimizing viscous drag.
Unlike heavy industrial lubricants, light gear oil must balance rapid fluid mobility at cold start-up with stable elastohydrodynamic lubrication (EHL) film thickness at operating temperatures. At Shandong Longhai Lubrication Technology Development Co., Ltd., we combine shear-stable polymeric viscosity modifiers with high-purity Group II and Group III hydrocracked base oils to maintain exact viscosity parameters even under continuous mechanical shear.
Our light gear oil formulations utilize an optimized Sulfur-Phosphorus Extreme Pressure (EP) additive package. This reactive chemistry generates a sacrificial micro-thin boundary film on meshing gear teeth. This prevents metal-to-metal contact, scuffing, and micro-pitting without causing chemical corrosion to copper-based alloy components, such as synchronizer rings or worm gear bushings.
A leading high-tech industrial enterprise specialized in R&D, blending, and global exportation of premium lubricants.
Established in 2009 and headquartered in Zibo, Shandong Province, Shandong Longhai Lubrication Technology Development Co., Ltd. has spent over 15 years developing integrated lubrication supply systems. As a trusted manufacturer, we supply both our domestic flagship brand "Century Longhai" and our international strategic brand, the British "A Ba" series. Our products are fully insured by the People's Insurance Company of China (PICC), ensuring global peace of mind and technical accountability.
Our manufacturing site spans 131 acres, yielding an annual capacity of 200,000 metric tons. We feature fully automated micro-metered filling lines, guaranteeing filling accuracy of 1‰-2‰ and boosting throughput by 20% to 35% over conventional lines. This guarantees stable, large-scale supply capabilities for global distributors, wholesalers, and OEM procurement managers.
Certified to ISO 9001:2015, ISO 14001, and ISO 45001 standards.
Certified by major automotive OEMs, including Mercedes-Benz approvals.
How modern machinery requirements drive innovation in gear lubrication chemistry and viscosity indices.
High fluid friction in traditional gear oils wastes energy. The industry is moving toward lighter grades (such as SAE 75W or ISO VG 46) to reduce fuel consumption and cut carbon footprints in industrial plants.
Surface fatigue (micro-pitting) is common in surface-hardened gears. Modern light gear oils include advanced anti-wear systems to safeguard surface finishes and prolong gear set lifespans.
Electric vehicle (EV) gearboxes require low-viscosity gear fluids that offer cooling properties, high dielectric strength, and compatibility with copper materials in integrated motors.
How Shandong Longhai addresses logistical challenges and local compliance requirements for international buyers.
Sourcing industrial lubricants globally requires strict compliance with international standards and consistent product quality. Shandong Longhai supports procurement departments with a complete suite of services designed to simplify transactions and ensure product performance:
Our advanced manufacturing and testing facility operates under strict international quality guidelines.
ISO Quality Certification
Mercedes-Benz OEM Approval
ISO 14001 Environmental System
ISO 45001 Occupational Health
Fully Automated Blending Reactors
Elemental Analysis & ICP Laboratory
Robotic Filling & Packaging Infrastructure
Shandong Longhai develops custom lubricant formulations tailored to your specific mechanical, thermal, and regulatory requirements.
Whether you require high-fluidity lubricants for low-temperature environments or shear-stable formulations for heavy-duty industrial machinery, our engineering team is here to assist. We customize gear oils and engine lubricants to match exact API, ACEA, and OEM requirements.
Our OEM/ODM services cover custom formulation development, viscosity index optimization, customized additive blending, and flexible packaging design. We support both trial production runs and large-scale industrial blending operations.
"We do not merely mix base oils. We build complex, long-lasting molecular protection packages that prolong gear life and optimize torque conversion efficiency."
— Chief Formulation Chemist, Shandong Longhai R&D Division
From initial design to final delivery, we follow a transparent and structured development process.
We analyze mechanical loads, operating temperatures, and compliance requirements to establish formulation targets.
Our R&D team selects premium base stocks and adjusts additive packages to achieve the target performance profile.
We perform simulated wear tests, viscosity shear checks, and corrosion protection assessments to verify targets.
Following formulation sign-off, we schedule full production runs utilizing our automated blending and filling lines.
We provide continuous technical assistance, including batch tracking, laboratory analysis, and regulatory support.
Essential guidance on selecting, sourcing, and purchasing light gear lubricants and heavy-duty fluids.
The primary difference is viscosity. Light gear oils (typically ISO VG 32 to 100 or SAE 75W-80) are engineered to reduce energy losses from fluid friction in high-speed, light-to-medium load systems, such as automated transaxles, robotics, and high-speed machine tools. Heavy gear oils (ISO VG 220 to 680 or SAE 80W-90 / 85W-140) focus on film strength to withstand heavy shock loads in industrial reduction gearboxes.
Not always. API GL-5 lubricants contain roughly double the concentration of sulfur-phosphorus extreme pressure (EP) additives compared to GL-4 oils. While GL-5 provides superior protection under extreme shock loads, these active sulfur additives can corrode yellow metals, such as brass and bronze, used in synchronizer rings or bushings in manual transaxles. In these applications, a dedicated GL-4 light gear oil should be selected.
We maintain consistency by sourcing high-purity base oils and globally recognized additive packages. Our production lines use fully automated PLC-controlled blending systems with precise mass-flow meters. Additionally, our QA laboratory runs sample tests on every batch (evaluating density, kinematic viscosity, viscosity index, flash point, and moisture levels) before filling is approved.
Our industrial gear oils comply with international performance standards, including DIN 51517 Part III (CLP), ISO 12925-1 (CKD), AGMA 9005-E02, and US Steel 224. This ensures compatibility and performance parameters align with major gearbox manufacturers worldwide.
Explore our refrigeration lubricants, high-performance motorcycle engine oils, and heavy-duty gear oils.
Longhai
