K-Seal Multi Purpose One Step Pour and Go Permanent Coolant Leak Repair ST5501 Automotive Additive 8oz Bottle
K-Seal Multi Purpose One Step Pour and Go Permanent Coolant Leak Repair ST5501 Automotive Additive 8oz Bottle
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K-Seal

K-Seal Multi Purpose One Step Pour and Go Permanent Coolant Leak Repair ST5501 Automotive Additive 8oz Bottle

4.2 stars out of 759 reviews
(4.2)|
759 ratings
K-Seal Multi Purpose One Step Pour and Go Permanent Coolant Leak Repair ST5501 Automotive Additive 8oz BottleK Seal T5501 Permanent Coolant Leak Repair 8oz for Cars Trucks and SUVs2 pack K Seal ST5501 Permanent Coolant Leak Repair 8oz for Cars Trucks and SUVs3 pack K Seal T5501 Permanent Coolant Leak Repair 8oz for Cars Trucks and SUVs
Pack Size:Single

Key item features

  • Permanent Repair: Permanently seals leaks and cracks in the cooling system, including radiators, cylinder heads, head gaskets, engine blocks, heater cores, and water pump casings.
  • Universal Compatibility: Compatible with all types of antifreeze and coolant, ensuring broad applicability without adverse reactions.
  • Effortless Application: Requires no draining or flushing of the cooling system prior to application, simplifying the repair process.
  • Broad Application: Effectively seals leaks in hard plastic and metal components within the cooling system.
  • Extensive Coverage: One 8oz bottle treats cooling systems with a capacity of up to 25 quarts, suitable for cars, trucks, and SUVs.
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Customer ratings & reviews

4.2 out of 5 stars
stars759 ratings408 reviews
How item rating is calculated
  1. 5 stars69% (524)
  2. 4 stars11% (85)
  3. 3 stars5% (39)
  4. 2 stars3% (19)
  5. 1 star12% (92)

Reviews summary

Pros
  • : Comes with easy-to-follow directions.
  • : Comes in a small size for easy storage.
  • : Seals coolant leaks in various vehicle types.
  • : Offers best value compared to competitors.
Neutral
  • : Can effectively seal small leaks, but may not handle larger ones.
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Showing 1-3 of 408 reviews

Jul 23, 2025
Jason
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

The absolute best product. Used in a 2014 Toyota Prius that had really bad valve cover leak. The car would shake horribly and the repair shop said it would cost thousands to fix. Put it in and with in 30 minutes there wasn't any hesitation. Radiator fluid levels remained the same. It's been several weeks and still running fine with 240000 miles on it.

Helpful?1XMJMMRYS4AF30391261
Nov 27, 2025
Alfreda
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Worked For Me!

I have had a leak in my heater core and tried various stop-leak brands. They all stopped the leak but then clogged my heater core. When I'd blow the clog out it would leak again. This product didn't do that. It just stopped the leak. I will buy other products from this company as needed.

Helpful?1XMJMMRYS4AF30391261
Sep 23, 2025
wayne
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Works and quickly

Bought it to stop a drip from the heater core. The entire floorboard had water under the carpet. It was a mess. Cleaned up the mess and put the K Seal small bottle, 8 oz. in the radiator. Ran the Highlander for 1 hour and the drip stopped. It has been over 1 month and still no leak. Highlanders have a known issue with leaks around the top of the radiator and ours had begun to be wet on top in one corner. After K Seal the area was dry. So far so good.

Helpful?1XMJMMRYS4AF30391261