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Transmission Fluid In Engine

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Transmission Fluid In Engine

Postby MorpheusHusky [OP] » Jun 07 2012, 3:01am

So today while changing my oil after draining it and putting a new filter on I went to put oil back in it. I usually put 5 quarts of oil and 1 quart of Lucas. I've been really tired lately and was not paying attention and grabbed the bottle of Lucas transmission fluid instead of the oil like a dumb @$$. I put about 1/10th of a quart in the engine before realizing what I had done. I got back under the truck and pulled the oil drain plug and filter off but nothing came out since it was such a small amount of transmission fluid that was in there. I put the filter back on and the plug back in and topped it off with the correct bottle of Lucas and the other 5 quarts of oil. I have not driven any distance at all, I took it around the block and let it idle (maybe a mile tops) and now it has a pretty noticeable knock that was not there before. It starts after idling for about 30 seconds. It does not knock when I drive though, just when I idle. Is this something that I need to drain out and replace ASAP or should I not worry about it for a day or 2? Pay day is coming up and I plan on changing it then but I don't wanna drive it if its going to do damage. Thanks in advance for the help and advice!
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Transmission Fluid In Engine

Postby Machster69 » Jun 07 2012, 3:10am

Yeh, some call it myth but some say itll clean the motor. If it was me, ide try and flush alittle with some oil, then fill it with oil like you did. Then after a few days, flush her out... I mean, you say its knocking now? You think its a placebo knock? Describe the knock more, does it follow rpms?
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Re: Transmission Fluid In Engine

Postby ant_mb » Jun 07 2012, 3:12am

I highly doubt that a tenth of lube would cause your engine to knock. My guess is your simply looking for something to be wrong so you are hearing things.:). The knock was probably always ere.
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Re: Transmission Fluid In Engine

Postby MorpheusHusky [OP] » Jun 07 2012, 3:13am

It only knocks after idling for aabout 30 seconds after starting or coming to a stop. It does not knock any other time and it has never knocked before. Its not a super loud knock and does not affect engine RPM. Also not a knock I can feel.
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Re: Transmission Fluid In Engine

Postby ant_mb » Jun 07 2012, 3:15am

There is no way a tenth of a quart of trams fluid is causing a knock. Something else is the culprit here.
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Transmission Fluid In Engine

Postby Machster69 » Jun 07 2012, 3:16am

This "knock"... Does it get faster/louder with rpms? Or does it get quiet?
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Re: Transmission Fluid In Engine

Postby MorpheusHusky [OP] » Jun 07 2012, 3:18am

Anything above idle RPMs it stops.
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Transmission Fluid In Engine

Postby Machster69 » Jun 07 2012, 3:21am

Is it possible that its injector noise that you havnt tried to listen to b4? I feel this is a placebo knock. Ive seen threads where people dump atf in there oil and run it for way longer than your talking. I highly doubt it caused any issues for you... Doesnt mean there is no issue. I jus doubt atf is the culprit!
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Re: Transmission Fluid In Engine

Postby MorpheusHusky [OP] » Jun 07 2012, 3:26am

Ok thanks for the info. So is it safe to drive for the next few days till payday? And how could I fix the knock if its injectors or placebo?
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Re: Transmission Fluid In Engine

Postby BlackZ71 » Jun 07 2012, 3:30am

MorpheusHusky wrote:So today while changing my oil after draining it and putting a new filter on I went to put oil back in it. I usually put 5 quarts of oil and 1 quart of Lucas. I've been really tired lately and was not paying attention and grabbed the bottle of Lucas transmission fluid instead of the oil like a dumb @$$. I put about 1/10th of a quart in the engine before realizing what I had done. I got back under the truck and pulled the oil drain plug and filter off but nothing came out since it was such a small amount of transmission fluid that was in there. I put the filter back on and the plug back in and topped it off with the correct bottle of Lucas and the other 5 quarts of oil. I have not driven any distance at all, I took it around the block and let it idle (maybe a mile tops) and now it has a pretty noticeable knock that was not there before. It starts after idling for about 30 seconds. It does not knock when I drive though, just when I idle. Is this something that I need to drain out and replace ASAP or should I not worry about it for a day or 2? Pay day is coming up and I plan on changing it then but I don't wanna drive it if its going to do damage. Thanks in advance for the help and advice!


I wouldn't loose any sleep over this small amount of fluid. Transmission fluid likely worked like a solvent and flushed some crud loose. Just drain and replace oil & filter first chance you get.
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