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🚗 Stop leaks before they stop you – drive worry-free with MANNOL!
MANNOL 9966 Radiator Leak Stop is a 325ml additive designed to seal leaks in cooling systems by targeting gaskets, clamps, and micro cracks. Compatible with all coolants and water, it hardens only at leak sites, resisting heat, vibration, and washout to provide durable, long-lasting protection and prevent future leaks.
| ASIN | B0050CIV5O |
| Best Sellers Rank | #681 in Automotive ( See Top 100 in Automotive ) #15 in Oil & Fluid Additives |
| Brand | MANNOL |
| Customer Reviews | 4.0 4.0 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 | 12 x 10 x 3 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.
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.
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.
S**I
leakage has stopped
Amazing product. One week now, leakage has stopped. So far so good.
M**Y
Amazing
Use this product and forget the leek Awesome 👍🏼👌🏼
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
P**Z
Habe mehrere Dichtmittel ausprobiert. Diese hat wirklich sofort funktioniert. Ich kann es empfehlen.
V**V
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
Hat gut geholfen bei Kühlwasserverlust
G**E
A lot of people say it does not work. I use a chevy 2007 and it worked great for me. I had to buy this 3 times. 1st time, full bottle used in 1 go, worked amazing. Went to mechanic, got a radiator flush and the leak came back up. 2nd time, used bottle 3 times cuz it was not sealing, did not work and leak continued. No mechanic involved 3rd time, got the bottle, used the full bottle in one go and it worked again. No mechanic involved Moral of story, use the entire content of the bottle in 1 go. It will work, if it doesn't, the leak is bigger than imagined.
S**L
If you see bubbles coming in your auxiliary coolant tank and engine keeps heating up, recommend this product to fix it.
Trustpilot
2 weeks ago
5 days ago