Engineered to excel under severe mechanical stress, thermal fluctuations, and heavy loads.
The global industrial and transportation sectors are undergoing a significant transition. While electrification dominates passenger car discussions, heavy-duty commercial transport, agricultural vehicles, mining machinery, and strategic manufacturing units still rely heavily on manual transmissions, automated manual transmissions (AMT), and heavy-duty gear units. These systems require lubrication media that can maintain structural film strength under immense shear forces and extreme temperatures.
As a leading Chinese manufacturer, our goal is to deliver manual gearbox oils that minimize friction, maximize power transfer efficiency, and eliminate micro-pitting in gear teeth. By combining high-viscosity index (VI) base stocks with sophisticated sulfur-phosphorus Extreme Pressure (EP) additives and active friction modifiers, our formulations protect synchronization mechanisms without compromising copper-alloy components. This technical balance ensures smooth shifting, extended gear life, and minimized mechanical downtime across global fleets.
Shandong Longhai Lubrication Technology Development Co., Ltd. was established in 2009 and is headquartered in Zibo, Shandong, China. As a high-tech enterprise integrating R&D, production, and international sales, we have spent over 15 years building a highly integrated industrial lubricants supply chain. We serve the heavy industry, transportation, and agricultural machinery sectors with top-tier fluid solutions.
Our domestic brand, "Century Longhai", and our international strategic partnership line, the British "A Ba" series, represent premium-grade engineering. Our extensive product portfolio covers diesel engine oils, gasoline engine oils, manual and automatic transmission fluids (ATF), hydraulic systems, industrial gear oils, marine lubricants, and eco-friendly cooling fluids. Every product is backed by quality guarantees and insured by the PICC (People's Insurance Company of China), giving global distributors, fleet managers, and industrial plants absolute peace of mind.
Our manufacturing complex features advanced automated blending machinery and high-speed filling lines configured for precision and flexibility. Utilizing computerized metering-filling systems, we guarantee filling accuracy margins of 1‰ to 2‰. This automated infrastructure boosts overall production speeds by 20% to 35% compared to conventional filling stations, ensuring rapid lead times for large-scale international orders.
We work in collaboration with research institutes and universities to maintain a forward-looking product development pipeline, ensuring our lubricants consistently meet or exceed international standards like API, ACEA, DIN, and ISO.
How we bridge the gap between quality, compliance, and cost-efficiency for international buyers.
Global procurement teams face diverse regulatory environments and shifting OEM operating parameters. Longhai addresses this by adjusting base oil groupings (Group II, III, or Synthetic PAO) and additive treats to match exact regional climates—from Arctic sub-zero starting conditions to heavy tropical humidity.
Importing lubricants requires meticulous documentation. We support procurement managers with complete Safety Data Sheets (SDS) in multiple languages, REACH compliance dossiers for Europe, and full customs and origin documentation to facilitate smooth border clearances.
Logistical delays disrupt production. Operating from Zibo, Shandong—a major industrial and transport hub close to the Qingdao Port—we optimize cargo container packing, leverage bulk flexitanks, and provide clear tracking details to ensure timely maritime deliveries.
A deep dive into shear stability, synchronizer compatibility, and friction physics.
A manual gearbox oil must possess a robust viscosity index (VI). Under heavy loads, oil temperatures can exceed 120°C. In these conditions, conventional oils thin out, causing metal-to-metal contact on gear flanks. Our manual transmission oils are formulated with shear-stable viscosity index improvers (VII) that resist permanent shear breakdown, keeping the protective film intact over extended drain intervals.
Older gear formulations relied on active sulfur additives that degraded yellow metals like copper and bronze—frequently used in synchronizer rings. Our specialized chemical systems utilize inactive sulfur-phosphorus chemistries. This forms a protective anti-wear barrier on gear tooth surfaces while remaining non-corrosive to yellow metals, preventing gear slippage and synchronizer clash.
While API GL-5 gear oils offer high concentrations of extreme-pressure additives suitable for hypoid differentials, using them in manual gearboxes requiring GL-4 fluids can cause synchronizer slippage or accelerated chemical wear. Longhai designs targeted GL-4, GL-5, and multi-spec manual gear oils to align precisely with your equipment's engineering designs.
From initial chemical analysis to high-speed automated packaging, we build your brand's technical advantage.
We develop fully synthetic, semi-synthetic, and premium mineral gear oil profiles customized to your target specifications. This includes modifying viscosity parameters, pour points, and oxidation thresholds to match regional market expectations.
Our infrastructure accommodates both small-scale trial batches for market verification and large-scale bulk industrial orders. We offer versatile packaging options ranging from 1L and 4L canisters to 18L pails and 200L steel drums.
Our on-site laboratory is equipped with precision testing systems (including ICP spectrometers, kinematic viscometers, flash point testers, and foam bath rigs) to ensure every batch aligns with strict international tolerances.
We offer end-to-end design and labeling services. Our team helps draft compliant, high-resolution product labels, technical data sheets (TDS), and commercial packaging designs to establish a professional market presence.
Reviewing technical specifications, target pricing, and local regulatory requirements.
Optimizing base oils and additive structures in our testing laboratory.
Validating physical-chemical properties and performance parameters.
Executing precision blending, automated filling, and quality inspections.
Managing global export logistics, customs clearing, and technical support.
At Longhai Technology, quality is the core foundation of our production processes. Our facilities are certified to international quality and environmental management systems: ISO 9001:2015 (Quality Management), ISO 14001:2015 (Environmental Management), and ISO 18001/45001 (Occupational Health and Safety).
Furthermore, our automatic transmission products have secured official approvals, including certifications from major global OEMs such as Mercedes-Benz. This validation underlines our capability to supply lubricants that perform consistently under demanding operating conditions, helping end-users extend service life and lower maintenance costs.
Expert insights on choosing, sourcing, and deploying high-performance manual gearbox oils.
Protecting mechanical drivetrains, heavy industrial gearing, and complex transmission lines.
Longhai