Best Head Gasket Sealer For Diesel: image
Best Price

Leaking heater core and radiator sealant from Bar’s Leaks Professional Fiber Block Seal Head Gasket and Cooling Sealant is one of the strongest anti-freeze compatible repairs on the market. The product has been tested to stop leaks up to 5 gallons per year. It can also be used as a temporary fix for cracks in pipes. Notably, it was approved by the National Institute of Standards (NIST) in 2015.

Honorable Mention

BlueDevil Head Gasket Sealer is a permanent solution for head gasket leaks, warped or cracked heads, and freeze plugs. The sealer contains no solid or particulate matter and will not clog your engine. It can be used in petrol and diesel engines as well as in electric vehicles. Not only does it prevent leaks but also helps to reduce fuel consumption. BlueDevil has been approved by the National Highway Traffic Safety Administration (NHS) for use in emergency situations.

Best Head Gasket Sealer For Diesel

Top 7 Best Head Gasket Sealer For Diesel

1

BlueDevil Head Gasket Sealer (38386)

1,694 ratings | 11 offers | 1,694 Reviews
Price: $49.95$73.93
Why we chose it
  • Contains no solid or particulate matter that can harm a vehicles engine
  • Good for Head Gaskets, Warped or Cracked Heads, Heater Cores, and Freeze Plugs
  • Safe and easy to use
  • Alternative solution for costly and time consuming repairs
  • Permanent Repair
BlueDevil Head Gasket Sealer (38386): image
82%
customers recommend this product
4.1/ 5
Easy to use3.9
Value for money3.5
Mileage3.5
2
Why we chose it
  • Permanent coolant leak repair – Just shake, pour and go
  • Fixes cracks and leaks in radiator, head gasket, freeze plugs, cylinder heads, heater core, water pump casing and engine blocks
  • No draining or flushing
  • Mixes with all antifreeze
  • If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn’t allow the product to reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully
K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair: image
86%
customers recommend this product
4.3/ 5
Easy to use4.6
Value for money4.1
Mileage3.7
3
Why we chose it
  • Stops heater core and radiator leaks
  • Fixes leaking freeze and core plugs
  • Seals cracked cylinder heads and blocks
  • Repairs blown head and intake gasket leaks
Bar's Leak HG-1-4PK HEAD SEAL Blown Head Gasket Repair - 33.8 oz, (Pack of 4): image
82%
customers recommend this product
4.1/ 5
4

Bar’s Leaks Block Seal Head Gasket Fix (Pack of 4),1111-4PK

1,133 ratings | 9 offers | 1,133 Reviews
Price: $83.78$128.29
Why we chose it
  • Seals cracked cylinder heads and blocks
  • Package Weight: 15.9 pounds
  • Repairs blown head gaskets
  • Stops block leaks
Bar's Leaks Block Seal Head Gasket Fix (Pack of 4),1111-4PK: image
84%
customers recommend this product
4.2/ 5
Value for money4
Mileage3.7
Top Pick
5

AT-205 Seal Leak Stopper 8 Ounce – 2 Pack

1,030 ratings | 4 offers | 1,030 Reviews
Price: $42.2$49.99
Why we chose it
    AT-205 Seal Leak Stopper 8 Ounce - 2 Pack: image
    88%
    customers recommend this product
    4.4/ 5
    Easy to use4.9
    Mileage4.3
    Value for money4.2
    6

    K&W 401224 FiberLock Head Gasket & Block Repair – 32 Fl Oz

    677 ratings | 1 offers | 677 Reviews
    Price starts from: $26.47
    Why we chose it
    • Easy Pour and Go Formula!
    • Seals larger holes with less fluid loss than competitive products as proven by lab test (ASTM D6107)
    • Permanently fixes head gaskets, engine blocks, cooling systems, and cylinder heads.
    • “Contains 3 unique technologies. Military-Strength Fibers create multi-layer repair over cracks with a web-like weave. Nanotechnology permanently fixes the smallest cracks and crevices. Cool-X Conditioner lowers operating temperature as it circulates through cooling system.”
    • Works with all antifreeze or plain water.
    K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz: image
    80%
    customers recommend this product
    4/ 5
    Easy to use3.9
    Value for money3.7
    Mileage3.6
    7
    Why we chose it
      BlueDevil Pour-N-Go Head Gasket Sealer - 16 Ounce (00209) by BlueDevil Products: image
      82%
      customers recommend this product
      4.1/ 5
      Ranking the Brands
      BlueDevil Products: 14.29%
      K-Seal: 14.29%
      Bar’s Leaks: 28.57%
      ATP: 14.29%
      K&W: 14.29%
      : 14.29%

      Comparison Table

      Сomparison: BlueDevil Head Gasket Sealer (38386): imageСomparison: K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair: imageСomparison: Bar's Leak HG-1-4PK HEAD SEAL Blown Head Gasket Repair - 33.8 oz, (Pack of 4): imageСomparison: Bar's Leaks Block Seal Head Gasket Fix (Pack of 4),1111-4PK: imageСomparison: AT-205 Seal Leak Stopper 8 Ounce - 2 Pack: imageСomparison: K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz: imageСomparison: BlueDevil Pour-N-Go Head Gasket Sealer - 16 Ounce (00209) by BlueDevil Products: image
      BlueDevil Head Gasket Sealer (38386)K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak RepairBar’s Leak HG-1-4PK HEAD SEAL Blown Head Gasket Repair – 33.8 oz, (Pack of 4)Bar’s Leaks Block Seal Head Gasket Fix (Pack of 4),1111-4PKAT-205 Seal Leak Stopper 8 Ounce – 2 PackK&W 401224 FiberLock Head Gasket & Block Repair – 32 Fl OzBlueDevil Pour-N-Go Head Gasket Sealer – 16 Ounce (00209) by BlueDevil Products
      ManufacturerBlueDevil ProductsK-SealBar’s LeaksBar’s LeaksCRC
      BrandBlueDevil ProductsK-SealBar’s LeaksBar’s LeaksATPK&W
      Item Weight2.87 pounds1 pounds2.5 pounds1.6 pounds10.6 ounces2.4 pounds1.1 pounds
      Package Dimensions10.31 x 4.8 x 4.17 inches7.8 x 6.3 x 1.57 inches7.32 x 2.68 x 1.65 inches
      Is Discontinued By ManufacturerNoYesNoYes
      Size1 PackPack of 4Pack of 4
      Product Dimensions5.9 x 4.1 x 1.9 inches3.2 x 3.2 x 9.8 inches2.6 x 2.6 x 9.4 inches3.4 x 3.4 x 9.54 inches

      Products with 5 star rating

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