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Old 06-25-2021, 07:36 PM
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Quote:
Originally Posted by 2021nightshade4x4 View Post
No one wants to fess up but the red coolant (OAT) causes gaskets to swell more than green (IAT) and compromises the good factory seal.

I remember just enough of high school chemistry to know that itís just as bad to keep adding fresh coolant because the new stuff is what REACTS, old stuff is stable and has already gotten into the gaskets and expanded.

Youíre doing a good thing for the COOLING system keeping fresh coolant in there, but those engine gaskets keep having a fresh supply of red that has not yet reacted with the gasket material and expanded further.

Like the old LLY GM Duramax trucks with 300k+ miles on them have heads done at least once. Usually at around 160k. The ones without head jobs were owner maintained (read: oil changes only) and left the original coolant in or just topped it up as needed.

Counterintuitive as all hell but makes sense when you think about it. A manufacturer would never advise you to NOT get something done - they have a vested interest in you getting fluid changes and the subsequent engine work thereafter.


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Are you saying that changing coolant at specified intervals is what causes head gaskets to fail? I have never heard or read anything like that. Is this your own theory? If not, would you provide a link to where you got this info? I would be interested in reading it. Thanks
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