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LONGHEAD SP Premium Motor Oil - The Ultimate Protection for Modern Vehicles

Premium SN Grade Fully Synthetic Motor Oil - The Ultimate Protection for Modern Engines

Premium SL Gasoline Engine Oils - Advanced Protection for Modern Engines

Premium SJ Grade Gasoline Engine Oil - Superior Protection and Performance

High-performance fully synthetic diesel engine oil - born for the extreme

Longhai CJ-4 Synthetic Diesel Oil – Premium Protection & Performance

Longhai CI-4 PLUS Premium Diesel Oil – Ultimate Engine Protection & Fuel Efficiency

Longhai CH-4 Heavy-Duty Diesel Oil – Advanced Wear Protection & Engine Cleanliness

Longhai CF-4 Diesel Engine Oil – High-Temperature Cleanliness & Heavy-Duty Protection

Longhai Heavy-Duty Gear Oil – Ultimate Protection for Extreme Conditions

China Longhai CJ-4 Synthetic Diesel Oil - Premium Performance from Top Suppliers & Factory

Advanced Protection for Modern Diesel Engines from China’s Leading Suppliers

Introducing Longhai API CJ-4 Full Synthetic Diesel Engine Oil, formulated with high-quality imported synthetic base oils and premium Afton additives. This state-of-the-art engine oil provides exceptional protection for advanced diesel engines found in today’s demanding applications. As a trusted product from a top factory in China, our formulation meets rigorous industry standards, ensuring superior wear protection, remarkable high-temperature stability, and dependable cold-weather performance. Choose Longhai for unmatched quality and reliability in diesel engine oil.

Product Details

Key Benefits & Features

✅ Ultimate Engine Protection

Synthetic technology ensures superior oil film strength, minimizing metal-to-metal contact and preventing wear under extreme operating conditions Advanced anti-wear additives provide critical component protection (turbochargers, pistons, bearings) even under heavy loads Specialized friction modifiers reduce energy loss while maintaining protective oil film integrity

✅ Advanced High-Temperature Performance

Exceptional thermal and oxidation stability prevents oil breakdown in high-heat environments Powerful detergency controls deposits and soot accumulation to maintain engine cleanliness Resists viscosity breakdown in turbocharged applications, ensuring continuous protection

✅ All-Climate Performance

Superior cold-flow properties enable quick cold starts and instant lubrication in freezing conditions Maintains stable viscosity across wide temperature ranges for consistent protection Excellent pour point characteristics for reliable operation in arctic conditions

✅ Meets Stringent Industry Standards

Fully compliant with API CJ-4 and ACEA E7-12 specifications Compatible with DPFs (Diesel Particulate Filters) and other aftertreatment systems to help reduce emissions Low SAPS (Sulfated Ash, Phosphorus, Sulfur) formulation protects emission control systems

✅ Extended Drain Capability

Enhanced TBN (Total Base Number) retention effectively neutralizes acids for extended service life Reduces maintenance costs while maintaining peak engine performance Advanced additive package resists depletion for longer-lasting protection

Technical Specifications

Base Oil Premium Synthetic (Group III/IV)

Additive Package Afton Technology

Available Viscosity Grades 15W-40, 10W-30

API Classification CJ-4

ACEA Specifications E7-12

OEM Approvals Meets major manufacturer requirements

Recommended Applications

✔ Modern diesel engines with exhaust aftertreatment systems

✔ Heavy-duty trucks and commercial fleets

✔ High-performance turbocharged engines

✔ Construction and mining equipment

✔ Long-haul transportation vehicles

Why Choose Longhai API CJ-4 Synthetic?

Proven Performance

Extensive laboratory and field testing validates superior protection

Cost Efficiency

Extended drain intervals reduce total cost of ownership

Engine Longevity

Keeps critical components cleaner for longer service life

Environmental Compliance

Helps meet Euro VI/EPA 2010 emissions standards

Experience the Longhai difference with our advanced CJ-4 synthetic formula - engineered to protect your investment and maximize operational efficiency.**

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Frequently Asked Questions

What is API CJ-4 diesel engine oil?

API CJ-4 is a heavy-duty diesel engine oil specification designed for high-speed, four-stroke engines. It is formulated to meet 2007 and newer model year on-highway exhaust emission standards, and is fully compatible with Diesel Particulate Filters (DPFs) and other aftertreatment systems.

Can Longhai API CJ-4 synthetic oil be used in older engines?

Yes, Longhai API CJ-4 synthetic oil is backward compatible, meaning it can safely and effectively be used in older diesel engines specifying previous API categories such as CI-4, CI-4 Plus, and CH-4.

What are the benefits of the low SAPS formulation?

The Low SAPS (Sulfated Ash, Phosphorus, and Sulfur) formulation prevents the buildup of ash and deposits in exhaust aftertreatment devices like Diesel Particulate Filters (DPFs), ensuring emission compliance and preventing filter clogging.

How does synthetic technology improve engine protection?

Synthetic technology provides a stronger, more stable oil film under extreme heat and pressure. It reduces metal-to-metal friction, prevents wear during cold startups, and resists thermal breakdown far better than conventional mineral oils.

Can this oil extend drain intervals?

Yes. Due to its high Total Base Number (TBN) retention and superior oxidation stability, Longhai API CJ-4 resists acid buildup and viscosity breakdown, allowing for extended drain intervals in accordance with OEM guidelines.