Liqui Moly 5156 Pro-Line Diesel System Cleaner 500ml

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.

Brilliant great for your engine

Perfect for your tanc and fuel consumption.

This treatment did make a difference especially with reducing smoke. As I have not used any kind of treatment in the last few years I think I need another treatment and then use annually when servicing.

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

Great

Good product!

Great products as usual .