D6 Fuel Oil | High-Quality Residual Fuel Oil Supply | Petroleum Products

D6 Fuel Oil, also known as Bunker Fuel, Residual Fuel Oil (RFO), or Heavy Fuel Oil (HFO), is one of the most important and widely consumed heavy petroleum fuels in the global energy and maritime sectors. As a high-viscosity, slow-burning fuel produced from the heavier fractions of crude oil, D6 plays a crucial role in large-scale industrial heating, marine engines, power generation and heavy-duty boilers. At PetroBNX, we provide premium-grade D6 Fuel Oil that meets international quality standards and ensures consistent performance for diverse industrial applications.

This page delivers a detailed overview of D6, its specifications, industrial uses, advantages, market relevance and supply capabilities.

What Is D6 Fuel Oil?

D6 is a heavy, residual fuel that remains after lighter products—such as gasoline, diesel, kerosene and jet fuel—are distilled out during the refining process. Because of its thickness, D6 typically requires preheating to reach optimal flow and combustion conditions.

D6 is commonly known as:

Bunker C Fuel

Residual Fuel Oil (RFO)

Heavy Fuel Oil (HFO)

#6 Fuel Oil

Marine Fuel Oil (MFO)

Due to its cost-effectiveness and high energy output, D6 is a preferred fuel for large engines and industrial systems designed to handle heavy fuels.

Characteristics of D6 Fuel Oil

D6 is defined by several key properties:

Very high viscosity

Low volatility

High heating value

Requires heating (typically 110–150°C) before burning

Used in engines and systems capable of processing heavy fuel types

Its thick consistency makes it unsuitable for small engines but ideal for large-scale industrial machinery.

Types of D6 Fuel Oil

Depending on sulfur content, application and refining source, D6 Fuel Oil is available in several grades:

1. High-Sulfur D6 Fuel Oil

Contains sulfur levels above 1%, traditionally used in:

Cargo ships

Power plants

Industrial furnaces

2. Low-Sulfur D6 Fuel Oil

Contains 0.5% sulfur or lower, meeting modern marine emission requirements (IMO 2020).

3. Marine Fuel Oil (MFO)

A specialized class of D6 intended for:

Large marine diesel engines

Ocean-going vessels

Auxiliary ship generators

4. Industrial Heavy Fuel Oil (HFO)

Designed for:

Boilers

Kilns

Asphalt plants

High-temperature industrial operations

Typical Specifications of D6 Fuel Oil

Although specifications vary by region and refinery, most international standards include the following ranges:

Viscosity: 1500 – 5000 cSt at 50°C

Density: 0.96 – 1.03 g/cm³

Sulfur Content: 0.5% – 3.5% (varies by grade)

Water & Sediment: < 1%

Ash Content: < 0.10%

Flash Point: Minimum 60°C

Heating Value: 39 – 41 MJ/kg

PetroBNX supplies D6 with a full set of documentation including:

Technical Data Sheet (TDS)

Certificate of Quality (COQ)

SGS Inspection (available on request)

Applications of D6 Fuel Oil

D6 is essential for industries requiring high-temperature, high-volume fuel with maximum combustion efficiency.

✔ Maritime Industry

D6 is one of the most widely used marine fuels in:

Cargo ships

Container vessels

Oil tankers

Bulk carriers

Passenger liners

Its energy density and affordability make it ideal for long-distance maritime operations.

✔ Power Generation

In many regions, D6 is used for:

Large power plants

Industrial-scale generators

Remote energy stations

Emergency backup power

Its slow-burning characteristics ensure stable electricity production.

✔ Industrial Heating Systems

Industries rely on D6 for:

Boilers

Furnaces

Kilns

Rotating ovens

Asphalt production systems

The ability to deliver continuous high heat output makes D6 ideal for heavy manufacturing.

✔ Petrochemical & Refining Industries

D6 is also used as:

Fuel for cracking units

Heat source for distillation towers

Backup energy for petrochemical complexes

✔ Asphalt & Bitumen Production

D6’s heavy consistency makes it compatible with:

Asphalt mixers

Bitumen heaters

Road construction facilities

Advantages of D6 Fuel Oil
1. High Energy Density

D6 provides exceptional heating value per unit, making it cost-effective in high-volume operations.

2. Cost Efficiency

As one of the least refined fuels, D6 offers a lower price compared to lighter petroleum products.

3. Stable Industrial Performance

Designed for large systems, it performs reliably under continuous, heavy-load conditions.

4. Ideal for Marine & Industrial Use

Large engines and boilers are specifically engineered to handle heavy fuel oil efficiently.

5. Long-Term Storage Capability

With proper handling and heating, D6 can be stored for extended periods without degradation.

Quality Standards & Regulations

D6 must meet international specifications such as:

ISO 8217 (Marine fuel standard)

ASTM D396 (Fuel oil classification)

IMO 2020 sulfur regulations

EPA industrial emissions standards

To ensure full compliance, PetroBNX conducts:

Carbon residue tests

Water & sediment analysis

Sulfur testing

Flash point verification

Metals and contaminants analysis

Each shipment is monitored for consistency and performance.

Global Market Overview

Demand for D6 Fuel Oil remains strong due to its use in:

Global maritime shipping

Heavy industrial infrastructure

Remote power generation

Developing energy markets

Major producers include:

Middle Eastern refineries

Russia

South America

Asia-Pacific refining hubs

As environmental regulations tighten, low-sulfur D6 is seeing increased demand across the maritime sector.

D6 Fuel Oil Supply & Procurement with PetroBNX

At PetroBNX, we provide reliable global sourcing and delivery of high-quality D6 Fuel Oil. Our services include:

Bulk D6 supply (High-Sulfur, Low-Sulfur, Marine Grade)

Vessel and barge delivery options

FOB, CIF, CFR and tank-to-tank transfers

Long-term industrial supply contracts

Competitive pricing aligned with global Platts benchmarks

Storage, logistics and customs support

Whether you need D6 for large-scale industrial heating, marine fleets or power generation, PetroBNX ensures a seamless and efficient supply chain.

D6 Fuel Oil remains a critical heavy petroleum product powering global shipping, industrial operations and large-scale energy systems. Its high efficiency, cost-effectiveness and strong heat output make it ideal for heavy-duty applications. At PetroBNX, we deliver top-quality D6 compliant with international standards, supported by reliable logistics, competitive pricing and professional customer service.

For inquiries, specifications or quotations, contact the PetroBNX sales team today.