Are oil leak sealants any good?

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Thread: Are oil leak sealants any good?

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    6.2 Liter LS9 Supercharged V8 griswold44's Avatar
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    Exclamation Are oil leak sealants any good?

    A friend of mine recently discovered an oil leak on his 1994 Honda Civic, and bought one of those solutions that you supposedly put in your engine and voila, leaks are gone.

    Now, he's worried that it might cause serious damage to the engine or that it just won't work at all. So, has anyone had any experience with this type of thing, and is it a safe thing to do?

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    GMI Staff Member Premium Member nailhead425's Avatar
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    Re: Are oil leak sealants any good?

    I don't think they work very well.
    On a 1994 engine, it is likely sloppy enough not to cause any issues.
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    4.6 Liter Northstar V8 Canyonaro's Avatar
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    Re: Are oil leak sealants any good?

    I always think of those things as a temp fix to a permanent problem. I wouldn't think anything would be wrong with it, but I in no way would want to consider it permanent.

    Others may/should pipe in and give you expert advice though.
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    Re: Are oil leak sealants any good?

    They are commonly referred to as "seal swellers". They will work most of the time but once in there for awhile, they tend to turn the seals to mush, and then they definitely need to be replaced.

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    6.2 Liter LS9 Supercharged V8 TiburonJT's Avatar
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    Re: Are oil leak sealants any good?

    I've always heard that they work well for a while, but long-term they will make the problem worse, as Nosman said.

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    Re: Are oil leak sealants any good?

    Quote Originally Posted by Nosman
    They are commonly referred to as "seal swellers". They will work most of the time but once in there for awhile, they tend to turn the seals to mush, and then they definitely need to be replaced.


    DOT 3 brake fluid does the same thing...

    It was an old used car trick....dump some brake fluid in the oil...makes the rubber seals swell until the next oil change...then the smoke & leaks appear! Same was true with transmissions... a bad-bad practice which I'm sure some of these roadside used car lots must do today still!!!


    Grissy...tell your friend to save his money & fix the leak vs just adding some crap to it...

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    6.2 Liter LS9 Supercharged V8 griswold44's Avatar
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    Re: Are oil leak sealants any good?

    I told him he should just take it to a mechanic, because I think the gasket is shot, but he wants to sell the car without sinking much money into it. Are gasket jobs complicated or expensive? And if it's worth noting, he said the leak has been there for at least the past 3 or 4 years.

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