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UPDATE Pg 2: OT Mechanics: Any experience using K-Seal Headgasket Repair Sealant?
Posted on 9/10/25 at 3:40 pm
Posted on 9/10/25 at 3:40 pm
I've a 2007 Chevy Silverado 5.3 with 250K miles. I bought the truck new and it has been a solid vehicle. I'd like to hold onto it and continue to use it., as I have maintained it throughout the years. It has just recently developed a coolant leak and has white smoke coming out of the exhaust upon startup. It isn't running hot. I am hesitant to spend over $2k for a full auto headgasket repair at an auto shop. Has anyone used K-Seal Ultimate or another pour-in headgasket repair sealant product that worked well and held up. TIA for your help.
This post was edited on 9/11/25 at 12:18 pm
18
Posted on 9/10/25 at 3:42 pm to Crappieman
quote:
using K-Seal Ultimate Headgasket Repair Sealant?
Posted on 9/10/25 at 3:44 pm to Crappieman
Chicken- we need an automobile board
Posted on 9/10/25 at 3:44 pm to Crappieman
Like a pour in oil leak sealant, works a little bit for a little while. It's a temporary stop gap item.
Posted on 9/10/25 at 3:44 pm to Crappieman
have it fixed correctly
Posted on 9/10/25 at 3:45 pm to Crappieman
Dont do it. Stop leak in the cooling system is bad news.
Again, DO NOT DO IT
Again, DO NOT DO IT
Posted on 9/10/25 at 3:47 pm to Crappieman
I think you are wasting your time with these pour in fixes. Does your oil look like chocolate milk?
Posted on 9/10/25 at 3:49 pm to Crappieman
quote:
I've a 2007 Chevy Silverado 5.3 with 250K miles. I bought the truck new and it has been a solid vehicle. I'd like to hold onto it and continue to use it.,
Then it needs to be fixed correctly.
Pretty much all leak stop/sealants only partially work and end up cause more problems in the future
Posted on 9/10/25 at 3:53 pm to Crappieman
Take it somewhere and have a coolant system leak down test performed.
Also, an intake manifold gasket failure can give a false cylinder head gasket failure indication which is a lot easier repair and cheaper than a cylinder head gasket replacement.
Also, an intake manifold gasket failure can give a false cylinder head gasket failure indication which is a lot easier repair and cheaper than a cylinder head gasket replacement.
This post was edited on 9/10/25 at 4:11 pm
Posted on 9/10/25 at 3:58 pm to Crappieman
You are either junking the car or spending the money for the repair.
That auto zone crap isn't going to do you any good.
That auto zone crap isn't going to do you any good.
Posted on 9/10/25 at 3:59 pm to Crappieman
I have watched episodes of Roadkill where they tried similar head gasket in a bottle leak fix. At best they made it a few miles farther down the road before engine blew up 
Posted on 9/10/25 at 4:08 pm to Crappieman
One more time -
DO NOT DO IT!!!
DO NOT DO IT!!!
Posted on 9/10/25 at 4:21 pm to Crappieman
no way that works. you got nothing to lose i guess.
Posted on 9/10/25 at 4:23 pm to Crappieman
Posted on 9/10/25 at 7:22 pm to Crappieman
I'm a master tech of 45 years, Don't do it, fix it the right way. It will gig=ve you a chance to check wear on cam and lifters. If it has wear do not scrimp on parts, get the good stuff.
Posted on 9/10/25 at 7:31 pm to The Mick
No, its not worth a frick even for that.
Stop posting until we have a free refrigerator thread
Stop posting until we have a free refrigerator thread
Posted on 9/10/25 at 7:35 pm to Crappieman
Bro, throw that away, go and get blue devil.
Ive seen it work multiple times.
Ive seen it work multiple times.
Posted on 9/10/25 at 8:02 pm to Crappieman
Don’t mess around with half-arse jury rigs.
Fix it right or get rid of it and get something you can depend upon.
Murphys Law will jump up and bite you.
Fix it right or get rid of it and get something you can depend upon.
Murphys Law will jump up and bite you.
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