Liqui Moly 5156 Pro-Line Diesel System Cleaner 500ml

I’m amazed at how well this has worked on my car. 13 year old diesel with almost 150k miles. Smokey in the mornings when started with a lovely engine pulse for the first few minutes, warming up. I did my annual service 3 days ago and normally add a different product. By chance, found this stuff and gave it a punt. Cold start, drove less than 1km to fill the tank and added this stuff. Start the car and almost instantly i can hear and feel a difference. No chugging. Smoother drive. More power. Drove 40 miles (recommends a 2km drive after adding) and i was sure i was just making myself believe it was better. 3 days in, driving 80miles a day to work, cold start each journey and im still a little shocked how my car has changed. Really, this stuff is awesome 👏 👌

I’ve driven my Mercedes A-Class from 22,000 miles to 106,000+ and always took care of it, but recently noticed the engine felt a bit lazy, especially on cold starts. Decided to give Liqui Moly Diesel System Cleaner a try — and I’m genuinely shocked by the results. I added one full can to 20L of diesel, then did a proper long motorway run (20miles) using higher revs (2,500–3,000+ rpm) to let the cleaner work its way through. Within the first 100 miles, I noticed smoother idle, better throttle response, and a more eager pull — especially at low to mid rpm. The real kicker? My commute MPG jumped from an average of 37–42mpg up to 52.7mpg — the highest I’ve ever seen in years of driving the same route! It’s like the engine’s been freed up. This stuff clearly cleaned up the injectors and combustion system because the car feels noticeably lighter and more responsive. Will absolutely be using this every 6 months as part of regular maintenance. Highly recommended for any diesel owner — especially high mileage cars.

Great

After using this diesel system cleaner, I noticed the engine felt a bit smoother, especially during acceleration. I also saw a small improvement in fuel economy, increasing from around 35 MPG to about 35.5 MPG. While the difference wasn’t dramatic, it was noticeable enough for me. Overall, it’s a good product, and I’d consider using it again as part of regular maintenance.

Seems to do the job my car injector Seems to be getting better thanks

Using for years and engine working smoothly with other diesel products from liquid molly never have engine problems with 10 years old car

Excellent used this afternoon soo many years found it on amazon, my injectors where running rough, filled 35 lts from empty tank then poured in the cleaner giving it a shake, then topped up another 35 littles, drove for about 24 miles on dual carriage way and started it clearing everything has picked up speed

Exact product good quality

Vertrouw er op dat het een goed additief is. Mijn oude dieselmotor heeft een uitstoot die ver onder de vereiste limiet blijft. Ik ben tevreden.

2005 model 1.6 tdci için güzel bir ürün.

Halb so teuer wie bei meiner Auto Werkstatt und hat bis jetzt Probleme bei meinem Fahrzeug verhindert.

Parfait sur les 100 premiers kilomètres régime un peu plus élevé au ralenti et après une horloge

Perfetto per la pulizia degli iniettori (disel)..