2025 guide to recommended additives for BlueHDi and modern diesel engines: benefits, expert advice, and Arexons products to keep your engine and FAP clean.
WHY USE AN ADDITIVE FOR MODERN DIESEL ENGINES
If you have a modern diesel – especially a BlueHDi PSA (Peugeot, Citroën, DS, Opel) – you already know that these days, just filling up and driving off isn’t enough.
Euro 5 and Euro 6 engines are sophisticated, with FAP/DPF, EGR, and high-pressure injectors . All elements designed to reduce fuel consumption and emissions, but they require care .
Regular use of a good diesel additive is not a whim: it is intelligent preventative maintenance that can:
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Reduce particulate matter buildup.
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Help the FAP regeneration.
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Keep injectors and fuel system clean.
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Reduce consumption and smoking.
BLUEHDI, EURO 5/6 AND PARTICULATE FILTER
PSA's BlueHDi systems combine FAP (particulate filter) and SCR (AdBlue) to reduce harmful emissions.
The most common problem?
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Incomplete regeneration of the FAP , especially on short journeys.
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Blockages that turn on the engine light.
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Increased wear of EGR and injectors.
✅ Related article: Diesel Particulate Filter (DPF) Problems: Causes, Symptoms, and Solutions in 2025
REAL BENEFITS OF A DIESEL ADDITIVE
Let's dispel a myth right away: the additive is not a miracle cure , but a valid ally if used correctly.
✔ Improves diesel combustion.
✔ Reduces the formation of residues and sludge.
✔ Facilitates FAP regeneration even at lower temperatures.
✔ Keeps injectors clean, preventing power drops.
✔ Reduces fuel consumption and emissions.
✅ Expert advice: "It's better to use it before the problem occurs, not when the engine light is already on!"
WHEN IS IT REALLY USEFUL?
A diesel additive is especially recommended if:
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You use your car mainly in the city or on short trips.
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You do a lot of on-off switching (like deliveries or commuting).
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You want to avoid forced FAP regenerations.
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You notice slight drops in performance or increased fuel consumption.
✅ Learn more: Best DPF Cleaning Additive: 2025 Guide to Cleaner Diesels
HOW TO CHOOSE A GOOD DIESEL ADDITIVE
Not all additives are created equal. Here's what a good product should have :
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Guaranteed compatibility with Euro 5/6 engines.
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Formula designed to help clean the FAP/DPF .
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Serious brand, with clear technical data sheet.
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Precise dosage indications.
⚠️ Avoid generic supermarket products without specifications: they often cost little but do nothing , or worse, they can damage delicate components.
✅ RECOMMENDED PRODUCTS FOR MODERN DIESEL ENGINES (AREXONS)
As a spare parts dealer, I want to recommend concrete, proven solutions , not slogans. Below you'll find three truly effective Arexons additives for BlueHDi and modern diesel engines.
✅ 9888 AREXONS INSTANT CLEANER DIESEL 325 ML
✔ Ultra concentrated additive for modern diesel engines.
✔ Improves combustion by reducing soot formation.
✔ Helps prevent DPF clogging.
✔ Keeps injectors and fuel system clean.
✔ Ideal for regular preventative use, especially on Euro 5/6 cars.
✅ 9844 AREXONS PROFESSIONAL DIESEL INJECTOR CLEANER 325 ML
✔ Professional formulation for high pressure injectors.
✔ Removes deposits that hinder the atomization of diesel fuel.
✔ Improves starting, acceleration and fuel consumption.
✔ Recommended in case of power drops or difficult starts.
✔ Perfect for PSA BlueHDi diesel.
✅ 9874 AREXONS MOTOR CLEAN PROFESSIONAL 300 ML
✔ Universal cleaning additive for diesel and petrol engines.
✔ Helps remove sludge and residue from the fuel system.
✔ Improves combustion, reducing emissions and consumption.
✔ Excellent for complete internal cleaning , even on engines with FAP.
🛠️ The spare parts dealer's advice
"There's no need to overdo it with additives: use them regularly, choose reputable brands like Arexons, and follow the recommended dosages and frequencies. The result? Fewer problems, more peace of mind while driving."
HOW TO USE A DIESEL ADDITIVE CORRECTLY
✅ Dosage
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Always follow the instructions on the package.
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It is usually poured into the tank before filling up, to mix well.
✅ Recommended frequency
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Intensive urban use → every full tank or every 2-3 full tanks, depending on the product.
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Mixed or highway use → less frequent, but still recommended periodically.
✅ Mistakes to avoid
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Don't mix different additives blindly.
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Do not use generic gasoline additives on diesel.
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Don't consider the additive as an alternative to coupons!
✅ Related article: PSA 1.5 BlueHDi engine recalls: problems and official checks
PROFESSIONAL TIPS FOR DIESEL MAINTENANCE
A quality additive is just one part of the strategy . Here are some other best practices:
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Alternate city driving and extra-urban journeys → helps regenerate the FAP.
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Always use good quality fuel.
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Follow the service schedule → check EGR, injectors, filters.
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Don't ignore warning lights or messages → go to the workshop immediately.
✅ Read also: Low-cost maintenance for the Dacia Sandero: how to save in 2025
Frequently Asked Questions
IS IT ALWAYS NECESSARY TO USE AN ADDITIVE?
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It is not required by law, but strongly recommended if you use your car a lot in the city.
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It is a prevention that costs little compared to a clogged FAP or injectors that need replacing.
CAN IT DAMAGE THE ENGINE?
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No, if used correctly.
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Just avoid substandard or uncertified products.
WHICH ADDITIVES SHOULD I AVOID?
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The generic “universal” ones without specifications for modern diesels.
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Economic formulas without guarantees.
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Random mixtures of different additives.
CONCLUSION
Quality diesel additives are a small investment that prevents big problems.
For a BlueHDi or any Euro 5/6 diesel , regular use of a specially formulated additive helps to:
✔ Avoid FAP blockages.
✔ Keep injectors and fuel system clean.
✔ Reduce consumption and emissions.
✅ My advice as a spare parts dealer: choose reputable products like Arexons, use them wisely, and combine them with regular maintenance. Your car will thank you.
