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🛡️ Stop leaks before they stop you — keep your engine running cool and confident!
MANNOL 9966 Radiator Leak Stop is a 325ml cooling system sealant additive designed to temporarily seal small leaks in radiators, heater cores, water pumps, gaskets, and clamps. Compatible with all coolant types and water, it treats cooling systems up to 12 liters and supports aluminium, copper, plastic, and composite radiators. Ideal for micro leaks, it offers a quick, easy, and effective solution to prevent coolant loss and engine overheating.
| ASIN | B0050CIV5O |
| Best Sellers Rank | #4,810 in Automotive ( See Top 100 in Automotive ) #51 in Oil & Fluid Additives |
| Brand | MANNOL |
| Customer Reviews | 3.8 3.8 out of 5 stars (92) |
| Date First Available | 8 January 2015 |
| Item Weight | 300 g |
| Item model number | 9966 |
| Manufacturer | MANNOL |
| Manufacturer Part Number | 9966 |
| Product Dimensions | 30.5 x 23.5 x 12 cm; 300 g |
| Voltage | 12 Volts |
R**L
Excellent Product
Had a small leakage since the last 3 months, after adding was repaired witin a 100KM drive.
M**Y
Recommended
Excellent product, the coolant leak stopped after driving 50Km. It is qualified item and recommended.
Q**Q
For 8 liters system I put two bottles and doesn’t work
I used two full bottles in the car radiator and still the same issue leak doesn’t stop
S**I
leakage has stopped
Amazing product. One week now, leakage has stopped. So far so good.
J**R
Not really sealed
Nothing changed. I bought other brands to redo the job.
S**A
Results seems to be as good as claimed by product seller
2nd week now, leakage has not been noticed yet. If any changes, it will be updated. So far so good.
M**Y
Amazing
Use this product and forget the leek Awesome 👍🏼👌🏼
Y**M
AVOID! AVOID! AVOID!
Avoid this product, it destroyed my whole cooling system. I had to change 6 cooling lines, thermostat, water pump and the radiator. The systems was corroded, blocked and full of rust. I spent around $4k to fix this mess.
P**Z
Klappt wirklich
Habe mehrere Dichtmittel ausprobiert. Diese hat wirklich sofort funktioniert. Ich kann es empfehlen.
V**V
Best product for radiator leakage
I have been seeing leakage in my radiator and coolant comes on the intercooler drop by drop so then I decided to use this mannol and magic happen I pour the it with coolant and drove my car for 20-30km and some level drop after that I again add some coolant and add more mannol next day morning my coolant level is same as last night and leakage stop thanks to mannol best product I ever used and safe for use in any kind of coolant and use it with the coolant _my car polo tdi 2017
P**R
Gutes Produkt
Hat gut geholfen bei Kühlwasserverlust
S**L
Really seals any leakages in the cooling system
If you see bubbles coming in your auxiliary coolant tank and engine keeps heating up, recommend this product to fix it.
H**G
Funktioniert bei kleinen Lecks
hat funktioniert und ist preiswert. Hatte Kühlwasserverlust beim 5er BMW F11, der wurde gestoppt. Erstmal also keine teure Reparatur :-)
Trustpilot
1 month ago
1 week ago