HVO Fuel and EN 15940: What Does the Standard Mean for HVO Users?

 HVO fuel is rapidly gaining attention as a practical alternative to conventional diesel, but one question often sits behind the excitement: what does EN 15940 actually mean for the people using it? The answer is reassuring: EN 15940 provides a clear technical framework for paraffinic diesel fuels such as HVO, helping users understand fuel quality, performance and compatibility.

In this guide, we’ll explain what EN 15940 is, how it relates to HVO fuel, what the standard covers, why vehicle compatibility still matters, and what users should check before switching to HVO.

What Is EN 15940?

EN 15940 is a European fuel standard covering paraffinic diesel fuel produced through synthesis or hydrotreatment. The current British version, BS EN 15940:2023, specifies requirements and test methods for these fuels and recognises two classes based on cetane performance.

For HVO users, this is important because HVO is produced through a hydrotreatment process and falls within the family of paraffinic diesel fuels covered by the standard. BSI's supporting technical material specifically identifies HVO as an example of paraffinic diesel produced by hydrotreatment.

Think of EN 15940 as a quality blueprint. Rather than simply calling a fuel “renewable diesel”, the standard establishes measurable requirements that help define what a compliant paraffinic diesel should look like.

Why Does HVO Fuel Need Its Own Standard?

HVO fuel is chemically different from conventional petroleum diesel, even though the two can perform similar jobs in compatible diesel engines.

Conventional road diesel is generally specified under EN 590, whereas paraffinic diesel is covered by EN 15940. The EN 15940 specification exists because paraffinic diesel has characteristics that can differ from conventional automotive diesel, including density and exceptionally high cetane performance in some fuel classes.

That distinction is crucial for anyone considering a switch.

It means HVO should not simply be judged as “diesel made from vegetable oil”. It is a technically specified paraffinic fuel with its own recognised requirements.

What Does EN 15940 Mean for HVO Fuel Users?

For the end user, the biggest benefit is confidence.

A fuel supplied as compliant with EN 15940 has been produced and tested against defined requirements. The standard covers characteristics and test methods relevant to paraffinic diesel fuel, helping suppliers and users work from a consistent technical specification.

This creates a solid foundation for fuel purchasing decisions.

However, there is an important distinction: meeting EN 15940 does not automatically mean every diesel engine is approved for HVO.

That is where vehicle manufacturer approval comes in.

HVO Fuel and Engine Compatibility

One of the most important points for HVO users is compatibility.

BSI states that vehicle manufacturers should be consulted regarding general engine warranty and that some existing vehicles may require validation before paraffinic diesel is used.

In simple terms, there are two separate questions:

1. Does the fuel meet the relevant fuel standard?
2. Has the engine manufacturer approved that fuel for the particular vehicle or equipment?

Both matter.

A vehicle manufacturer may explicitly approve HVO/EN 15940 fuel, while another model may have different requirements. Ford, for example, advises customers to consult the fuel-quality information for their specific vehicle when considering HVO.

That makes checking the manufacturer's documentation a wise first step.

Real-Life Example: A Fleet Switching to HVO

Imagine a UK construction company operating 12 diesel vans and several generators.

The company wants to reduce its reliance on fossil diesel, so the fleet manager chooses HVO fuel. Before placing a large order, they check the manufacturers' documentation and confirm which vehicles and equipment are approved for paraffinic diesel meeting EN 15940.

The switch then becomes far more seamless.

Instead of treating HVO as an experimental fuel, the business has approached the change through three sensible steps: verify the fuel specification, verify equipment compatibility and then organise a reliable supply.

What Are the Main Characteristics of EN 15940 Fuel?

EN 15940 covers a range of technical properties that help determine whether paraffinic diesel is fit for its intended purpose.

These include fuel characteristics associated with ignition quality, volatility, viscosity, density, climate performance and other quality parameters. The standard also distinguishes between high-cetane and normal-cetane classes.

For an everyday HVO user, you do not necessarily need to memorise every laboratory test.

Instead, focus on the bigger picture: a recognised fuel specification gives suppliers, equipment manufacturers and users a common technical language.

High Cetane Performance

Cetane number is particularly relevant to diesel combustion.

A higher cetane number generally indicates better ignition quality, although actual engine performance depends on the complete fuel and engine system rather than one specification alone.

EN 15940 recognises different paraffinic diesel classes, including a high-cetane class.

That can be particularly valuable when businesses are evaluating fuel performance alongside emissions, equipment compatibility and operating conditions.

EN 15940 vs EN 590: Are They the Same?

No.

EN 15940 and EN 590 are different fuel standards.

EN 590 is the specification commonly associated with conventional automotive diesel, while EN 15940 covers paraffinic diesel from synthesis or hydrotreatment. Paraffinic diesel does not simply become EN 590 diesel because it is suitable for use in a compatible diesel engine.

This distinction is often misunderstood.

For HVO users, the important lesson is that HVO has its own recognised specification rather than needing to be treated as ordinary diesel.

That clarity is refreshing in a fuel market where terms such as renewable diesel, biodiesel, HVO and diesel are sometimes used interchangeably.

What Should You Check Before Buying HVO Fuel?

If you're considering HVO for vehicles, machinery, generators or other diesel equipment, take a practical approach.

HVO Fuel User Checklist

Before switching, check:

• Fuel specification: Ask whether the HVO complies with the applicable EN 15940 requirements.
• Manufacturer approval: Check your vehicle, machinery or generator manufacturer's guidance.
• Warranty conditions: Make sure using HVO does not conflict with applicable warranty requirements.
• Fuel quality: Purchase from a reputable supplier with appropriate quality controls.
• Storage arrangements: Make sure tanks, hoses and dispensing equipment are suitable for the intended fuel.
• Operating environment: Consider seasonal and temperature conditions where the equipment will operate.
• Supply reliability: Ensure your supplier can provide consistent fuel when your operation needs it.

This checklist provides a simple way to turn a technical standard into a practical purchasing decision.

Does EN 15940 Mean HVO Is Automatically Renewable?

Not necessarily.

This is another important distinction.

EN 15940 is primarily a fuel quality and specification standard. It defines paraffinic diesel requirements; it does not, by itself, certify the sustainability credentials or feedstock origin of every fuel sold under the standard.

HVO can be produced from different feedstocks, including waste oils and fats, and its environmental benefits can vary depending on the raw materials and production pathway.

BSI's technical guidance notes that HVO can contribute to increasing renewable or non-crude-derived content in transport fuels, while also explaining that paraffinic diesel can originate from different synthesis or hydrotreatment routes.

So, fuel quality and sustainability credentials should be considered separately.

Why EN 15940 Matters for Businesses

For businesses operating fleets, agricultural machinery, construction equipment or generators, fuel consistency can have a powerful operational impact.

A recognised specification makes it easier to discuss fuel requirements with suppliers and equipment manufacturers.

It can also support more informed procurement decisions because buyers are not relying solely on marketing descriptions. Instead, they can ask a precise question:

“Does this HVO meet EN 15940 requirements, and is my equipment approved for it?”

That question is much more meaningful than simply asking whether a fuel is “green diesel”.

Is HVO Fuel a Drop-In Replacement?

The phrase “drop-in fuel” is often used when discussing HVO, but users should treat it carefully.

HVO can be used in many compatible diesel engines, and manufacturers have increasingly approved paraffinic diesel fuels. However, approval varies between vehicles and equipment. BSI specifically highlights the need to check compatibility, while manufacturers such as Ford provide vehicle-specific guidance.

So don't assume that every diesel engine can automatically use HVO simply because the fuel meets EN 15940.

Checking first is the prudent approach.

Frequently Asked Questions

1. What is EN 15940 in simple terms?

EN 15940 is a European standard that specifies requirements and test methods for paraffinic diesel fuels produced through synthesis or hydrotreatment. HVO is one type of fuel that falls within this category.

2. Can I use EN 15940 HVO in any diesel vehicle?

No. A vehicle must be compatible with paraffinic diesel fuel, and the manufacturer should be consulted before use. Some manufacturers approve HVO, while others may require specific conditions or validation.

3. Is EN 15940 the same as EN 590?

No. EN 15940 covers paraffinic diesel, while EN 590 covers conventional automotive diesel. HVO should therefore be assessed against the appropriate specification rather than automatically being treated as EN 590 diesel.

Conclusion: A Clearer Way to Understand HVO

EN 15940 gives HVO users something valuable: a recognised technical framework for understanding paraffinic diesel fuel quality.

But the standard is only one part of the decision. Before switching, confirm that the HVO meets the appropriate specification and, crucially, that your vehicle or equipment manufacturer approves its use.

If you're considering HVO fuel for your vehicles, machinery, generators or business operations, speak with a reputable fuel supplier about product specification, compatibility and dependable delivery. A little thoughtful checking today can help make your transition to HVO smoother, safer and more confident tomorrow.