K-Seal Ultimate Head Gasket Repair, Stop Leak For Head Gaskets and Block  Antifreeze & Coolant, Money Back Guarantee 16 oz Bottle
K-Seal Ultimate Head Gasket Repair, Stop Leak For Head Gaskets and Block  Antifreeze & Coolant, Money Back Guarantee 16 oz Bottle
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K-Seal Ultimate Head Gasket Repair, Stop Leak For Head Gaskets and Block Antifreeze & Coolant, Money Back Guarantee 16 oz Bottle

3.9 stars out of 246 reviews
(3.9)|
246 ratings

Key item features

  • Effortless Application: K-Seal is simple to use, requiring only shaking and pouring into the cooling system, with no draining or flushing needed.
  • Permanent Repair: This product provides a lasting solution for blown head gaskets, cracked heads, and porous engine blocks, designed for the lifetime of the vehicle's engine.
  • Universal Compatibility: K-Seal's unique formula works on all water-cooled vehicles and mixes with all types of antifreeze, without requiring the system to be ice cold.
  • System Integrity: It is the only product that can be added to the overflow tank and positively will not clog the coolant system.
  • Versatile Application: A single 16oz bottle treats cars, SUVs, and trucks, and also works on heater cores and freeze plug leaks.
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Current price is $22.97$1.44/fl oz
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Columbus, 43215
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K-Seal Ultimate Head Gasket Repair, Stop Leak For Head Gaskets and Block Antifreeze & Coolant, Money Back Guarantee 16 oz Bottle $22.97 $1.44/fl oz

K-Seal Ultimate Head Gasket Repair, Stop Leak For Head Gaskets and Block  Antifreeze & Coolant, Money Back Guarantee 16 oz Bottle
current price $22.97
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K-Seal Ultimate Head Gasket Repair, Stop Leak For Head Gaskets and Block Antifreeze & Coolant, Money Back Guarantee 16 oz Bottle

3.9 out of 5 Stars. 246 reviews

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Customer ratings & reviews

3.9 out of 5 stars
stars246 ratings134 reviews
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Reviews summary

Pros
  • : Directions are easy to follow and clearly written.
  • : Prevents further engine damage from small leaks.
  • : Quickly stops coolant and gasket leaks.
Cons
  • : May not withstand massive tears or blown head gaskets.
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Showing 1-3 of 134 reviews

Jan 27, 2026
Peter
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

K-Seal worked on my Caddy

My 2002 Cadillac Deville overheated last summer. With only 78K miles on it, that's apparently when the head gasket problem started. Lately I was losing coolant and getting white smoke in the exhaust, plus the smell of antifreeze, all signs of a head gasket issue. Several repair shops I tried refused to even work on the NorthStar engine and one mechanic told me the best thing was to just get a new engine. Not wanting to spend 5 or 6 thousand I didn't have on a new motor, I researched the internet and found K-Seal. I figured it was worth a shot. I bought two bottles and just added it to my coolant tank. Drove the car and got it up to operating temp, and after about 10 miles of driving the engine seemed to smooth out and the white exhaust smoke was gone. The next day I checked the coolant level and it was exactly where it was the day before, no loss. Cranked the car and it purred like a kitten. K-Seal really worked !

Helpful?4ORCJV89PLBU55010307
Nov 6, 2025
ADK1
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

K seal engine cooling system sealer

My customer had a $9500.00 dealer estimate for an engine. Issue was an engine miss on startup cold from coolant in the cylinder. K seal fixed the issue!

Helpful?4ORCJV89PLBU55010307
Feb 1, 2026
Kitke
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

It works great

My husband purchased this product, and liked it so much he bought a larger quantity. I have no idea what he used it for, but he is very particular, so he clearly believes this is good value for the money, and an effective product.

Helpful?4ORCJV89PLBU55010307