High-performance formulations designed to secure operational efficiency, prevent oxidation, and reduce component wear under extreme operating temperatures and mechanical loads.
Established in 2009 in Zibo, Shandong—a major industrial and petrochemical hub of China—Shandong Longhai Lubrication Technology Development Co., Ltd. has spent over 15 years developing and synthesizing advanced lubrication technologies. As a high-tech pioneer, we integrate research, manufacturing, and global shipping services to power the maritime and heavy industrial sectors.
Under our proprietary brand "Century Longhai" alongside the international strategic brand British "A Ba" series, our formulations span complex marine diesel engine oils, turbine oils, gear systems, heavy duty hydraulic fluids, refrigeration oils, and specialized greases.
To guarantee complete financial security and peace of mind for ship owners and industrial operators, all our products are fully backed and insured by the PICC China People's Insurance Company.
As the maritime sector shifts toward environmental compliance, decarbonization, and low-emissions, the tribology of Marine Diesel Oils (MDO) has evolved. Longhai remains at the forefront of this shift, formulating lubricants that handle extreme mechanical loads and complex fuel chemistry.
With IMO regulations capping global fuel sulfur at 0.50% (and 0.10% within ECAs), modern marine diesel engines operate primarily on VLSFO and ULSFO. Longhai has engineered low-TBN (Total Base Number) trunk piston engine oils that match acid neutralization capabilities with high detergency, preventing lacquer deposits and cylinder liner wear without building excess ash deposits.
Alternative fuels like LNG, Methanol, and Ammonia introduce unique combustion byproducts. Methanol combustion can cause formic acid condensation, requiring specialized alkaline buffer systems, while Ammonia introduces oil-nitration risks. Our R&D team allocates 5% of annual revenue to developing ashless dispersants and custom base mixtures that preserve viscosity stability when using alternative fuels.
Under hydrodynamic and boundary lubrication states, metal-to-metal contact inside marine cylinders can cause scuffing. Our lubricants feature organometallic anti-wear packages that build a chemical shield on cylinder liners, retaining piston ring seal integrity even during long low-load operations.
| Lubricant Category | Primary Application | TBN Range | Viscosity (SAE) | Key Technical Performance Focus |
|---|---|---|---|---|
| Marine Cylinder Oils | 2-Stroke Crosshead Engines | 40 - 100 | SAE 50 / 60 | Combustion acid neutralization, thermal stability, piston ring cleanliness. |
| System Oils | 2-Stroke Crankcase Lubrication | 5 - 10 | SAE 30 / 40 | Oxidation resistance, bearing protection, water separation capacity. |
| Trunk Piston Oils (TPEO) | 4-Stroke Medium-Speed Propulsion | 15 - 50 | SAE 30 / 40 | Insoluble dispersal, soot suspension, anti-scuffing protection. |
| Industrial Auxiliary Oils | Gearboxes, Compressors & Hydraulics | N/A | ISO VG 32 - 320 | High demulsibility, extreme pressure protection, anti-foam. |
Modern marine operations go beyond propulsion engines. Vessels require a suite of industrial fluids to maintain cargo pumps, cranes, refrigeration systems, steering gears, and auxiliary turbines. Longhai offers complete onboard lubrication solutions that match the needs of heavy maritime industries:
Operating from our 131-acre manufacturing center in Shandong, we blend advanced automation with strict quality controls to ensure consistent fluid performance and reliable deliveries.
Our facilities utilize automated batch blending systems and metering-based filling lines. This system guarantees filling precision between 1‰ and 2‰, minimizing product giveaway and ensuring volume consistency. By automating these lines, we have increased filling speeds by 20% to 35%, allowing us to fill bulk marine oil drums quickly and meet tight shipping deadlines.
Our laboratories are equipped with analytical instruments including ICP emission spectrometers, cold-cranking simulators, and automated viscometers. Every production batch of marine oil undergoes testing for viscosity index, flashpoint, pour point, water separation, and foam stability, ensuring our products perform under high-temperature and high-pressure conditions.
With our 200,000-ton capacity, we maintain deep safety stock levels of Group II/III base oils and additives, insulating our global clients from supply chain volatility and sudden market shifts.
Longhai operates under strict international quality guidelines, ensuring all lubricants meet global marine engineering standards and regulatory demands.
Our manufacturing processes are certified to ISO 9001:2015 (Quality Management System), ISO 14001:2015 (Environmental Management System), and ISO 45001 / 18001 (Occupational Health and Safety Management System). Our automatic transmission lubricants have earned prestigious certifications, including the Mercedes-Benz OEM approval.
Our marine diesel engine oils and industrial lubricants meet standard requirements across the industry, including API (American Petroleum Institute) SN, CK-4, CJ-4, CI-4 Plus, CH-4, CF-4, and L-CKD industrial standards. This compliance ensures our products function safely within multi-brand fleets, protecting main propulsion machinery, auxiliary generators, and heavy-duty deck gear.
We provide private-label solutions and customized formulation services for international distributors, shipping fleets, and heavy equipment manufacturers.
We develop fully synthetic, semi-synthetic, and mineral oil blends tailored to specific operating conditions, engine designs, or regional fuel sulfur levels.
Our facility supports production runs ranging from small, specialized batches to continuous high-volume supply, utilizing diverse packaging styles (bulk drums, IBC totes, 18L containers, or retail bottles).
We provide laboratory reports and certification support to confirm our customized blends comply with API, ACEA, and relevant OEM standards.
We offer graphic design, label compliance consulting, and logistics management to help build your brand identity and ensure smooth import procedures.
Procuring marine diesel lubricants involves balancing acquisition costs with operational reliability. Poor quality oils can lead to engine downtime, cylinder wear, and increased fuel consumption. Longhai focuses on helping buyers control their Total Cost of Ownership (TCO):
Expert answers to common technical and procurement questions from marine superintendents, vessel engineers, and bulk buyers.
The correct TBN level is determined by the sulfur content of the fuel used in your engine. For low-sulfur fuels like VLSFO (0.50% sulfur) or ULSFO/MGO (0.10% sulfur), a medium to low TBN oil (typically 15 to 40 TBN for trunk piston engines, and 40 to 70 TBN for cylinder lubricants) is suitable. Utilizing high TBN oils with low-sulfur fuels can lead to ash deposits on piston crowns, causing cylinder wear and valve burning.
Cylinder oils are once-through lubricants injected directly onto the piston liners of massive two-stroke crosshead engines. They are formulated to burn cleanly and neutralize strong acids. Trunk piston engine oils (TPEO) operate in four-stroke engines where the same oil lubricates both the cylinder liners and the crankcase, requiring balanced dispersant properties to manage soot buildup over long cycles.
Cross-utilization must align with equipment manufacturer specifications. Marine auxiliary systems face moisture contamination and load shifts. Utilizing dedicated air compressor oils (such as ISO VG 68/100) and specialized gear oils (like L-CKD) ensures demulsibility and wear protection that general-purpose automotive lubricants cannot provide.
Quality control is managed at our ISO 9001 certified plant through automated mass-flow blending lines, in-house laboratory testing of base oils and additives, and batch retention protocols. Every shipment is backed by a Quality Certificate and insured by the PICC China People's Insurance Company.
From heavy-duty industrial gear systems to precision refrigeration oils, our product range covers essential applications for transport, manufacturing, and shipping.
Shandong Longhai Lubrication Technology Development Co., Ltd. operates under our core policy: "planning big strategies, focusing on technology, creating high quality, and keeping reputation". We deliver reliable fluid technology and supportive partnership to distributors, logistics coordinators, and fleet superintendents globally.
Our distribution network serves clients across 139 cities in 29 Chinese provinces and autonomous regions, alongside export routes to global marine centers. Partner with Longhai to optimize machinery wear protection, manage fuel changes, and secure a reliable supply chain.
Our plant, engineering centers, and QA laboratories are situated in Zibo, Shandong, China. Visitors are welcome to tour our facilities and witness our blending, packaging, and testing operations.
Longhai