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K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology - 32 Fl Oz

3.9 3.9 out of 5 stars 299 ratings
$25.00 $0.78 per Fl Oz
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Purchase options and add-ons

Brand CRC
Package Information Bottle
Liquid Volume 32 Fluid Ounces
Item Weight 2.7 Pounds

About this item

  • Package length: 4.394 cm
  • Package width: 8.610 cm
  • Package height: 24.206 cm
  • Product Type: AUTO ACCESSORY

Frequently bought together

K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology - 32 Fl Oz
$25.00 ($0.78/Fl Oz)
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CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz
$16.58
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.5 x 4 x 9 inches; 2.7 Pounds
  • Item model number ‏ : ‎ 401232
  • Date First Available ‏ : ‎ July 7, 2004
  • Manufacturer ‏ : ‎ CRC
  • ASIN ‏ : ‎ B000M8NZ70
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    3.9 3.9 out of 5 stars 299 ratings

Product Description

Using Nanotechnology, this product fills in cracks & crevices other products can't, making a stronger, more solid bond that's permanently hardened to the surface area.

From the brand

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Customer reviews

3.9 out of 5 stars
3.9 out of 5
299 global ratings

Customers say

Customers have expressed concerns about the coolant leakage and condition of the engine lubricant. For example, they mention that the head gasket went bad and leaking water from radiator into engine block. Opinions are mixed on performance, coolant loss, and smoke.

AI-generated from the text of customer reviews

40 customers mention23 positive17 negative

Customers are mixed about the performance of the machine lubricant. Some mention that it works well, eliminates problem within minutes, and is a great product. Others say that it didn't work at all, only worked for 20 minutes, or has minor issues with running above normal.

"...No coolant loss whatsoever, no smoke, smooth running; the product worked amazingly well so far...." Read more

"...would say they don't know why these things were created, they don't really work; and since it was made to block up, it will block up un-desired areas..." Read more

"Saved another head gasket replacement.Works well, have used on several different vehicles...." Read more

"...2. Rough running when startingAfter the car had been sitting for more than 4 hours, it would run rough for 2 or 3 minutes...." Read more

11 customers mention6 positive5 negative

Customers are mixed about the coolant leakage. Some mention that it works amazingly, with no exhaust gases leaking into the cooling system. However, others say that it causes the head gasket combustion leak and coolant wetting the spark plugs. The engine overheats until it is allowed to cool and the air pocket rises.

"...It has been 6 weeks, and the Jag is running PERFECTLY. No coolant loss whatsoever, no smoke, smooth running; the product worked amazingly well so..." Read more

"...The engine will overheat until it is allowed to cool and the air pocket rises to the expansion tank...." Read more

"...I just did a dye test on the radiator and still no exhaust gases leaking into the cooling system...." Read more

"...PLUGS REMOVED THAT ARE BELIEVED TO BE CULPRITS CAUSING THE HEAD GASKET COMBUSTION LEAK...." Read more

7 customers mention3 positive4 negative

Customers have mixed opinions about the smoke produced by the machine lubricant. Some customers report no coolant loss, while others say their car blows out a thick white smoke for a few minutes every morning.

"...SYMPTOMS I did not have:There was no smoke or steam visible in the exhaust. There was no oil visible in the coolant...." Read more

"...gasket blew, with all the typical signs: coolant loss, white smoke with a sweet smell coming from the right exhaust, and soon after from the left..." Read more

"...No coolant loss whatsoever, no smoke, smooth running; the product worked amazingly well so far...." Read more

"...and leaked the water from radiator into engine block and so creates a white smoke when the engine got started from cold...." Read more

7 customers mention0 positive7 negative

Customers are dissatisfied with the leakage of the machine lubricant. They mention that the head gasket went bad and the water from radiator leaked into the engine block. They also say that the coolant poured out the overflow bottle and clogged their radiator.

"...This occurs during the intake cycle or at rest when coolant leaks past the head gasket into the cylinder...." Read more

"...My mechanic told me that that the head gasket went bad and leaked the water from radiator into engine block and so creates a white smoke when the..." Read more

"...YEP! DIDN'T WORK- AIR AND WATER KEPT SPEWING OUT MY RADIATOR NECK AS I TRIED TO BLEED THE SYSTEM.NOW GET THIS!!!..." Read more

"...on my truck for the first week and a half or two and then it started to leak again...." Read more

3 customers mention0 positive3 negative

Customers are dissatisfied with the condition of the machine lubricant. They mention that it arrived damaged, with an external crack and a bad head gasket.

"...all kind of engine lights....My mechanic told me that that the head gasket went bad and leaked the water from radiator into engine block and so..." Read more

"...And yet it was my fault for believing in fairy tales. The problem was an external crack, just some coolant loss...." Read more

"Product arrived damaged. Submitted full refund complaint..." Read more

Product arrived damaged. Submitted full refund complaint
1 Star
Product arrived damaged. Submitted full refund complaint
Useless..Product arrived damage and spilled out into packaging container. Hazardous liquid material. Taken to UPS storeFor full return and refund.
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Top reviews from the United States

Daniel M.
5.0 out of 5 stars Worked like a miracle on my 2000 Jaguar XJR
Reviewed in the United States on September 11, 2018
Verified Purchase
I have a 2000 Jaguar XJR with 140,000 miles; the head gasket blew, with all the typical signs: coolant loss, white smoke with a sweet smell coming from the right exhaust, and soon after from the left exhaust. Several mechanics recommended an engine swap, which would cost $3,500+.

Since I was out of an engine anyways, I decided to give one of those good old head gasket miracle fix products a shot. I found a video on youtube of a mechanic who recommended this product, but with a different, prolonged approach; instead of only leaving the product for a half hour or so, he recommended leaving it for many days and running in for hundreds of miles until the leak was sealed. I decided to give that a try.

I followed the instructions: coolant flush, then pour in the water with the product, let it run for a bit. But instead of doing another flush, I left the water with the product overnight with the coolant cap off, then ran the car for 20-30 mins everyday for a week.

The day after, the white smoke (vapor) was almost the same. On the 2nd day, there was much less smoke. 3rd day, even less. By the 6 or 7th day and about 100 miles of driving, the smoke had disappeared.

I did the flush to eliminate the product and replaced it with coolant. Also changed the oil. It has been 6 weeks, and the Jag is running PERFECTLY. No coolant loss whatsoever, no smoke, smooth running; the product worked amazingly well so far.

I will update this with any changes in the next few months.
27 people found this helpful
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Frederick Blackett
5.0 out of 5 stars and I fell in love with that method and decided I will try this ...
Reviewed in the United States on February 11, 2015
Verified Purchase
I had many queries before I bought this stuff. where some mechanics would say try it it beats taking your engine down; others would say they don't know why these things were created, they don't really work; and since it was made to block up, it will block up un-desired areas. The conclusion I drew for myself was it seems according to readings that, if you have a severe problem it might not work, but if you problem is mild it will help. So while reading I bounced into a method of using it on You tube, that states they do it slightly different to the instructions on the back; and I fell in love with that method and decided I will try this thing and do it that way. And from the first day I used it I got good results. The engine has not failed since that day. The best method I discovered though is to apply it using an old radiator, then install your better one after a few hundred miles. My engine would have been fixed long ago if I had listened to the first mechanic an apply it earlier. I cannot guarantee how long it will last, but for months now it is still going. It's a excellent product.A review from you tube states $1500 in a bottle(meaning it saves you taking down your engine and costing that or more).
7 people found this helpful
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Norteño
1.0 out of 5 stars Creo que el producto no es específico para lo que está diseñado
Reviewed in the United States on April 4, 2024
Verified Purchase
No me agradó el producto no cumplio con las expectativas para lo que es requerido según es para sellar fugas de agua que se está pasando al aceite y no funciono
One person found this helpful
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Buz E
4.0 out of 5 stars Fixed one of my problems
Reviewed in the United States on August 28, 2010
Verified Purchase
I used the CRC 'Permanent Head Gasket & Block Repair with Nanotechnology' in my 1999 Cadillac SLS Northstar at 118,000 miles.

Here were my symptoms:

1. Overheating

When the outside temperature was 90 degrees, driving at highway speeds (60-70 mpg) with occasional acceleration due to passing, lane changes or slight grades would result in the temperature gauge going from the normal 12 o'clock position to 1, 2, or even 3 o'clock.

Warning messages would progress from 'Engine coolant hot' to 'AC turned off' to 'Idle engine Now' to 'Change oil'

Slowing to 45-50 mph (side roads) would allow the engine to cool enough for the temperature gauge to drop. Exiting the highway and idling the engine or shutting it off for 5 to 10 minutes was sufficient to bring the temperature back to normal.

The next morning I would need to add coolant to the overflow tank, so the pressure in the cooling system was high enough to push past the pressure cap.

When the outside temperature was lower, the same things occurred, just at different speeds.

2. Rough running when starting

After the car had been sitting for more than 4 hours, it would run rough for 2 or 3 minutes. And, when accelerating from a stop at a traffic light, the engine would not run perfectly smooth. The effect was subtle and it felt like driving over mildly rough pavement.

My regular mechanic replaced the radiator, then the cooling fans, then the thermostat and pressure cap. Each of these helped the engine run cooler longer, but did not cure the problem. He then performed a test and found evidence of combustion products in the coolant. He recommended a new engine for $7000 + installation. He will no longer do head gasket replacements because he has been burned when they do not last.

As a last resort, I purchased the product and had my regular mechanic apply the product using the recommended procedure.

SYMPTOMS I did not have:
There was no smoke or steam visible in the exhaust. There was no oil visible in the coolant. There was no coolant visible in the oil.

RESULTS:
Problem 1 (overheating) was not fixed.
Problem 2 was cured.

I have since had the head gaskets replaced and head bolt inserts installed ($2000 + motor mounts + tensioner + serpentine belt). Mechanic #2 who performed this job specializes in Northstar head gasket replacement. You can find a similar mechanic by searching for 'Specializing in Northstar Head Gasket Repairs' plus your local area. He said my head gasket problem was at the very beginning stages.

He said problem #1 occurs at combustion when the high pressure of the cylinder (usually #1) blows past the head gasket and creates an air pocket in the cooling system. The engine will overheat until it is allowed to cool and the air pocket rises to the expansion tank. He said problem #2 is caused by coolant wetting the spark plugs. This occurs during the intake cycle or at rest when coolant leaks past the head gasket into the cylinder. In severe cases so much coolant gets into the cylinder that the starter motor cannot turn.

Am I happy with the product? Yes, I felt it was worth spending a few bucks to confirm the diagnosis of a blown head gasket. And it provided a smoother running engine while I searched for a mechanic who would guarantee his work for a year.

Is this product the answer to every problem? No, not if you have a Northstar that starts overheating when under load.
33 people found this helpful
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Jeff Walker
5.0 out of 5 stars It works!
Reviewed in the United States on October 22, 2023
Verified Purchase
Saved another head gasket replacement.
Works well, have used on several different vehicles.
But doesn't work so well on turbo charged engine, too much pressure in cylinders.
FOLLOW THE DIRECTIONS!!! Otherwise it won't work. Lots of steps and takes some time, but done correctly I've had great results.
One person found this helpful
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