Quick answer
Many Peugeot models use an onboard additive (Eolys fluid) stored in a small tank near the fuel tank or rear axle. When low, you’ll see a dash alert. A refill can cost around £100–£200 at a garage, plus labour.
Detailed answer
Peugeot’s 3008, 308, and Partner diesel models commonly employ a special fluid, often referred to as Eolys, to assist with DPF regenerations. This fluid mixes with the fuel to lower soot’s ignition temperature, making regeneration easier. Over time, the reservoir depletes, typically after 60,000 to 80,000 miles, depending on driving conditions.
Where’s it located? Usually, the additive tank or pouch is close to the main fuel tank, either under the car or near the rear axle area. Some models have a rigid plastic tank, while others use a flexible pouch. Access might require removing a shield or wheel arch liner.
Refill process:
1. Diagnosis: A dash warning might read “Diesel Additive Minimum Level” or similar. Check your manual or scan tool to confirm.
2. Access the tank: Raise the car or use ramps for better undercarriage access. You may need basic tools to remove protective covers.
3. Refill: Use only the correct Eolys fluid recommended by Peugeot. The fluid type can vary (Eolys DPX 42, Eolys Powerflex, etc.) depending on your car’s year. A typical refill volume is 1–3 litres.
4. Reset the additive counter: The car’s ECU tracks fluid usage, so you must reset it via a diagnostic tool or the manufacturer’s software. If you skip this, the warning may remain.
A garage typically charges £100–£200 or more, covering both the fluid and labour. DIY is possible, but you still need a proper scan tool to reset the system. If you ignore a low additive alert, the DPF can clog sooner, and you’ll risk bigger bills or limp mode.
Common pitfalls:
– Mixing the wrong fluid can damage the system or hamper regeneration.
– Failing to reset the additive counter leads to persistent dash warnings or incorrect dosing.
– If you run out of additive completely, your filter might not regenerate at all, hastening blockages.
Peugeot’s approach to DPFs is slightly different than some other automakers that rely purely on passive and active regens. Eolys fluid helps burn off soot at lower temperatures, ideal for city drivers who don’t always reach high motorway temps. But it means an extra step: additive refills.
So, for a Peugeot 3008, 308, or Partner, keep an eye on that additive level warning. If you see it, don’t delay. Topping up the correct Eolys fluid and resetting the counter promptly can keep your DPF happy and avoid bigger headaches. Do it yourself if you’re comfortable working underneath the car and handling diagnostic tools, or let a qualified mechanic handle it for peace of mind.
