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

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

4.2 stars out of 803 reviews
(4.2)|
803 ratings
K-Seal ST5501 Multi Purpose One Step Pour and Go Coolant Leak Repair 8oz BottleK Seal Multi Purpose One Step Permanent Coolant Leak Repair 8oz Bottle2 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

  • Seals leaks and cracks in your cooling system
  • Compatible with all types of antifreeze
  • No draining or flushing required for application
  • Effectively seals head gaskets heater cores and cylinder heads
  • Treats cooling systems with a capacity of up to 25 quarts in cars, trucks and SUVs
  • Seals hard plastic and metal
Current price is Now $12.47
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was $14.00
$1.56/oz
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Customer ratings & reviews

4.2 out of 5 stars
stars803 ratings413 reviews
How item rating is calculated
  1. 5 stars69% (556)
  2. 4 stars11% (90)
  3. 3 stars5% (42)
  4. 2 stars2% (19)
  5. 1 star12% (96)

Reviews summary

Pros
  • : Simple instructions make it accessible to users.
  • : Directions are simple and easy to read.
  • : Provides an affordable alternative to pricey repairs.
  • : Effectively seals coolant leaks in car engines.
Neutral
  • : Can effectively stop small leaks, but may clog or only temporarily fix larger ones.
  • : Effective for small leaks, but inconsistent with larger ones.
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Showing 1-3 of 413 reviews

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
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
Feb 1, 2026
David
Top Reviewer
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

I used this for a possible head gasket leak in my Dodge Dakota, milky dip stick and water dripping from muffler seem.Changed oil and filter then added k-seal let it idle around 20 minutes and the next day no smoke,milky dip stick or leaking seem ,it's been over a weak and still good..I would give it a try for the price and hasn't clogged radiator or anything up..Temp fix but works!

Helpful?1XMJMMRYS4AF30391261