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⚡ Clean smarter, drive stronger — don’t let your engine miss out!
LIQUI MOLY 8931 Catalytic-System Cleaner is a 300ml liquid formula designed to remove sediments and impurities from your vehicle’s intake and combustion systems. Featuring chlorine reduction technology and an unscented, uncoloured composition, it enhances engine efficiency while being mindful of environmental impact. Highly rated by thousands, it’s a compact, professional-grade solution for maintaining catalytic system health.





| ASIN | B00XBOFZK2 |
| Benefits | Chlorine Reduction |
| Best Sellers Rank | 15,907 in Automotive ( See Top 100 in Automotive ) 157 in Fuel Systems |
| Brand | Liqui Moly |
| Brand Name | Liqui Moly |
| Capacity | 300 Millilitres |
| Container Type | Bottle |
| Contains Liquid Contents? | Yes |
| Country of Origin | Germany |
| Customer Reviews | 4.3 out of 5 stars 2,383 Reviews |
| Included Components | no |
| Item Form | Liquid |
| Item Type Name | Catalytic-System Cleaner |
| Item Volume | 300 Millilitres |
| Item Weight | 0.3 Kilograms |
| Item form | Liquid |
| Item volume | 300 Millilitres |
| Manufacturer | Liqui Moly |
| Material Features | Unscented |
| Material feature | Unscented |
| Model Number | 08931 |
| Number of Items | 1 |
| Part Number | 8931 |
| Scent | Unscented |
| Size | 1 ml (Pack of 1) |
| Special Features | Chlorine Reduction |
| Specific Uses For Product | Automotive Exterior |
| Specific uses for product | Automotive Exterior |
| Unit Count | 1.0 millilitre |
I**I
Brilliant.
Use it as instructed on the Company official website. Works perfect, you will need to erase computer errors, eventually. Engine work smooth.
N**R
Works great.
Good value for money, excellent service, this item works as it should very happy with the result.
M**N
Great
Great
N**B
Good options, good value for money
Good product, a solution to save money rather than replacing the part ! Have done this about a week ago let’s see how long it lasts !
K**F
Fully recommend
Working as should, recommend
A**B
Works as preventative not if your CAT is stuffed
Would've been great if this stuff worked for me but my Catalytic convertor must be shot. They may have been a slight improvement but the engine & stability control lights are back on and it runs rough at times and struggles up hills, poor performance when pulling away. I suspect this would be a good idea to use every 3-6 Months as a preventative in keeping the CAT in good health as long as the CAT is in good health to start with.
L**H
On-time delivery and excellent packaging
Delivery was on time as scheduled, and the product packaging was excellent. Very satisfied with the purchase.
M**E
Surprised how good value
Great value for money 😀 transformed performance on a 2003 petrol and brought emissions to pass level. Spray as a mist into air body whilst engine is set to 3000 revs the revs will purge and judder after take for a spirited run 😉
J**A
Buen producto
Lo compré porque se prendió el código 0420 lo apliqué en el cuerpo de aceleración borré el código ye tiene 3 semanas y no ha vuelto a parecer el código si vuelve a marcar el código modifico mi reseña
M**G
جيد
جيد
A**Y
Very good product.
This product is amazing and does the job well. I opened the can and pore the content in a spray can. It's the spray can used by a barber. I opened the air pipe between the turbo charger and the airbox. The engine should be at its normal operational temperature. The engine RPM was maintained at 1500rpm. I gave a small burst of 2 sprays at a time in the turbo. Please note the engine RPM goes up after spraying. Once it comes to 1500, spray again. Do this till you spray 50% of the spray can. Keep the remaining 50% for the next time or you may put that in the fuel tank. There was a noticable reduction in the smoke coming from the exhaust even at 4000RPM. This product definately works. Improvement observed after doing the process. Engine runs very smooth and accleration has gone up. The accelerator feels very light. I used it on my Ford Aspire diesel as it was giving some black smoke. I am very happy after using this product. Please follow the same process for petrol vehicles too.
O**Y
Ça fonctionne
Tout ce que je peux dire c'est que ça marche ! Le pot catalytique était pollué par de l'huile suite à un casse moteur, donc grosse fumée. Après pulverisation du produit a 2500tr/mn complété par un roulage 1/2 heure à 3000 tr/mn, le pot a été complètement nettoyé, plus de fumée.
A**Z
Funciona
eficaz, utilizar con combustible premium, solo medio deposito por bote, circular por autopista en una velocidad mas corta, a unas 3000 rpm
Trustpilot
1 month ago
2 weeks ago