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

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

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

  • Leak Sealing: Seals leaks and cracks within the cooling system, including radiators, cylinder heads, head gaskets, engine blocks, heater cores, and water pump casings.
  • Antifreeze Compatibility: Compatible with all types of antifreeze and coolant, ensuring broad applicability without adverse reactions.
  • Application Simplicity: Requires no draining or flushing of the cooling system prior to application, offering a one-step pour and go solution.
  • System Capacity: One 8 fl oz bottle effectively treats cooling systems with a capacity of up to 25 quarts in cars, trucks, and SUVs.
  • Material Versatility: Works on both hard plastic and metal components within the cooling system, providing comprehensive leak repair.
  • Clog Prevention: Designed to seal leaks without clogging or damaging any part of the cooling system.
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Customer ratings & reviews

4.2 out of 5 stars
stars870 ratings425 reviews
How item rating is calculated
  1. 5 stars70% (607)
  2. 4 stars11% (94)
  3. 3 stars5% (46)
  4. 2 stars2% (21)
  5. 1 star12% (102)

Reviews summary

Pros

  • : Simple instructions make it accessible to users.
  • : Comes in a small size for easy storage.
  • : Offers a reasonable solution.

Neutral

  • : Can effectively seal some leaks, but may not work for all.
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Showing 1-3 of 425 reviews

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
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