The difference between HVO and biodiesel is that HVO is a hydrogenated, oxygen-free hydrocarbon, while biodiesel is oxygenated fatty acid methyl esters (FAME). HVO has better storage stability, cold-weather performance, and engine compatibility, whereas biodiesel is biodegradable and made from renewable oils.
The push for cleaner, sustainable fuels has accelerated in recent years, and diesel alternatives like HVO (Hydrotreated Vegetable Oil) and biodiesel have become increasingly popular. Both are renewable fuels designed to reduce greenhouse gas emissions and dependence on fossil fuels. However, while they share similarities, HVO and biodiesel differ significantly in production methods, chemical properties, performance, and applications. This guide explains everything you need to know about these fuels, their differences, benefits, limitations, and suitability for modern diesel engines.
Understanding Biodiesel
Biodiesel is a renewable diesel substitute made from vegetable oils, animal fats, or recycled cooking oils. Chemically, biodiesel is composed of fatty acid methyl esters (FAMEs), produced by transesterification. During this process, triglycerides in the oil react with alcohol, usually methanol, in the presence of a catalyst to form biodiesel and glycerine.
Biodiesel can be used in diesel engines either as pure B100 or blended with standard diesel at ratios such as B5 (5% biodiesel) or B20 (20% biodiesel). It is biodegradable, renewable, and helps reduce carbon emissions and pollutants like carbon monoxide and hydrocarbons.
Biodiesel is widely used in road vehicles, agricultural machinery, heating systems, and generators, offering a sustainable alternative to fossil diesel while remaining compatible with most diesel engines with little or no modification.
Understanding HVO (Hydrotreated Vegetable Oil)
HVO, or Hydrotreated Vegetable Oil, is an advanced renewable diesel produced using a hydrogenation process. Unlike biodiesel, HVO is not chemically an ester but a fully paraffinic hydrocarbon, which is very similar to conventional fossil diesel.
HVO is made from feedstocks like:
- Vegetable oils – Rapeseed, sunflower, palm oil
- Animal fats – Tallow or lard
- Waste and residue oils – Used cooking oils and industrial by-products
During the hydrogenation process, these oils are treated with hydrogen under high temperature and pressure in the presence of a catalyst. This removes oxygen from the feedstock, producing a clean, high-quality fuel that is fully compatible with modern diesel engines, including Euro 6 vehicles.
Key Differences between HVO and Biodiesel
Although both HVO and biodiesel are renewable fuels, they have several important differences:
1. Production Process
Biodiesel is produced via transesterification, yielding fatty acid methyl esters (FAME), whereas HVO is produced via hydrogenation, converting feedstocks into paraffinic hydrocarbons.
This difference affects stability, engine compatibility, and cold-weather performance.
2. Chemical Properties
Biodiesel (FAME) contains oxygen in its chemical structure, while HVO is hydrocarbon-based and oxygen-free. This gives HVO a higher energy density, better oxidative stability, and less tendency to absorb water, making it more stable in storage.
3. Engine Compatibility
HVO can be used in most modern diesel engines without modifications, including vehicles with advanced emission control systems. Biodiesel, particularly B100, may require engine adjustments or careful blending due to its solvent properties and potential to degrade rubber seals in older engines.
4. Cold Weather Performance
HVO has a better cold-flow performance, meaning it gels less at low temperatures. Biodiesel can gel or solidify in cold weather, requiring additives or blends with standard diesel for safe use.
5. Emissions Reduction
Both fuels reduce greenhouse gas emissions, but HVO typically produces slightly lower NOx emissions and has cleaner combustion due to its hydrocarbon structure. Biodiesel reduces CO2 and particulate matter but can increase NOx in some engines.
6. Storage Stability
HVO is more stable during long-term storage because it does not oxidise easily or absorb moisture. Biodiesel is prone to degradation and microbial growth if stored improperly, requiring stabilisers or regular turnover.
7. Lifecycle and Sustainability
Both fuels are renewable, but HVO offers a longer lifecycle with fewer maintenance issues for engines. Biodiesel is often preferred when feedstock is locally available or when circular-economy benefits (such as recycling cooking oils) are a priority.
Applications of HVO and Biodiesel
HVO Applications
- Road diesel replacement for Euro 5 and Euro 6 vehicles
- Heavy-duty trucks and buses
- Agricultural machinery and off-road equipment
- Heating oil and generators
- Marine and industrial applications
Biodiesel Applications
- Diesel vehicles, especially fleet vehicles with blends like B20
- Agricultural tractors and harvesters
- Heating systems and industrial boilers
- Backup generators
HVO is often chosen for modern engines requiring high performance and compliance with emission regulations, whereas biodiesel is widely used where feedstock availability, sustainability, and cost-effectiveness are key considerations.
Benefits of HVO
- High engine compatibility – Works in modern diesel engines without modification
- Excellent storage stability – Can be stored for long periods without degradation
- Improved cold-weather performance – Less likely to gel in winter
- Lower emissions – Reduces NOx and particulate matter compared to biodiesel
- Renewable and sustainable – Made from vegetable oils, animal fats, and recycled oils
Benefits of Biodiesel
- Renewable and biodegradable – Reduces environmental impact
- Reduces CO2 and particulate emissions – Cleaner than fossil diesel
- Compatible with older engines – Blends like B5 or B20 can be used without modifications
- Supports circular economy – Waste oil can be recycled into fuel
- Widely available – Easy to source from suppliers, including 123 Oil
Limitations
HVO Limitations
- Slightly higher cost than biodiesel
- Limited feedstock availability in some regions
- Infrastructure for large-scale production is still growing
Biodiesel Limitations
- Prone to cold-weather gelling
- Oxygen content can affect engine seals and fuel injectors in high concentrations
- Less storage stability, requiring additives or blending
- Can increase NOx emissions slightly in some engines
Conclusion
HVO and biodiesel are both renewable diesel alternatives, but they differ significantly in production, chemical composition, engine compatibility, storage, and emissions. HVO is a hydrogenated, oxygen-free hydrocarbon suitable for modern engines and cold climates, with superior storage stability. Biodiesel is an oxygenated FAME fuel, widely used, biodegradable, and ideal for older engines or where recycled feedstocks are preferred.
Choosing between HVO and biodiesel depends on engine type, climate, storage conditions, and sustainability goals. For high-performance engines, HVO is ideal, while biodiesel remains a cost-effective, environmentally friendly solution. Using quality renewable fuels from trusted suppliers like 123 Oil ensures reliable performance, compliance, and reduced environmental impact.
Frequently Asked Questions
HVO is hydrogenated and oxygen-free, while biodiesel is made from fatty acid methyl esters and contains oxygen.
Yes, HVO is compatible with most modern diesel engines without modifications.
Both are renewable, but biodiesel reduces CO2 and particulate matter, while HVO reduces NOx and offers superior cold-weather performance.
HVO is more stable and resistant to oxidation and microbial growth than biodiesel.
Yes, biodiesel can be blended with HVO or fossil diesel to improve cold-weather performance and engine compatibility.
