Mixing transmission fluid and engine oil?

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Old 10-01-2015, 12:26 PM
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Mixing transmission fluid and engine oil?

Has anyone heard of adding a bit of transmission fluid into the engine oil?
I've been told this could help with softening some of the seals inside and help clean out the engine.

Let me know what you guys think.
Old 10-01-2015, 12:34 PM
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Keep the engine oil in the engine.

Keep the transmission fluid in the transmission.
Old 10-01-2015, 12:40 PM
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I don't know about you, but experimenting & mixing fluids with 2 very important & expensive components based on something you "heard" sounds risky.

The way I see it, engine oil is already formulated to cleanse your engine components.
Old 10-01-2015, 01:09 PM
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Meh. Don't do it.
Old 10-01-2015, 01:21 PM
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A long time ago, transmission fluid was used to "flush" an engine because it is basically 10 weight oil.

Nowadays, modern oils have way more cleaning detergents. This is not recommended or necessary.
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Old 10-01-2015, 03:05 PM
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meh.. i do it to my miata but not often. like.. i'll throw in a little to bring my oil level up and do a lap around my neighborhood before I do my oil change but not every oil change.
Old 10-01-2015, 03:07 PM
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sounds highly risky with variable reward... I'd steer clear of this one.
Old 10-01-2015, 03:23 PM
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Originally Posted by thoiboi
sounds highly risky with variable reward... I'd steer clear of this one.
I trust you. You're the engineer.
Old 10-01-2015, 03:27 PM
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Originally Posted by HBaJ
I trust you. You're the engineer.
ya damn right!
Old 10-01-2015, 03:29 PM
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I've put blinker fluid in the crankcase. Got like 30hp gain.
Old 10-01-2015, 03:32 PM
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Originally Posted by NSXNEXT
I've put blinker fluid in the crankcase. Got like 30hp gain.
BRUHH!!! YOU TOO?? i was trying to keep it a secret but since you let the cat out of the bag, this is the brand I use:
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Old 10-01-2015, 05:09 PM
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^ Have you tried their new synthetic fluid? Holy cow it's awesome and I can go twice as long without changing it now...
Old 10-01-2015, 05:12 PM
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You should ask Rockyboy
Old 10-01-2015, 05:33 PM
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Originally Posted by thoiboi
BRUHH!!! YOU TOO?? i was trying to keep it a secret but since you let the cat out of the bag, this is the brand I use:
Would this clean up the carbon deposit in my Avant?
Old 10-02-2015, 09:03 AM
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Ive used trans fluid to wipe down and oil the cyl walls while building an engine to keep it lubed and protected during a build, but i wouldnt mix the 2 for driving. And what seals could possibly "Need" to be softened inside the engine? Hint...... NONE. Stick with a quality oil/syn oil and you will be fine.
Old 10-02-2015, 09:41 AM
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^ Werd. A good synthetic will soften seals without over doing them, although I remember hearing back in the day that a car with a lot of miles on it that's only had dino oil it's whole life could possibly be harmed by using full synthetic since it'll soften the seals too much causing leaks..
Old 10-02-2015, 09:44 AM
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Originally Posted by JS + BRZ
Would this clean up the carbon deposit in my Avant?
Yes it will. Pour the entire bottle into your windshield washer reservoir and top with a 50/50 mix of lacquer thinner and distilled water, then proceed to drive it like you stole it. Should clean out the carbon deposits and give you a few extra ponies under the hood.
Old 10-02-2015, 01:56 PM
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Originally Posted by SuperTrooper169
Yes it will. Pour the entire bottle into your windshield washer reservoir and top with a 50/50 mix of lacquer thinner and distilled water, then proceed to drive it like you stole it. Should clean out the carbon deposits and give you a few extra ponies under the hood.
So excited! YES!
Old 10-06-2015, 01:29 PM
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Originally Posted by juniorbean
^ Have you tried their new synthetic fluid? Holy cow it's awesome and I can go twice as long without changing it now...
Oh man.. I've heard only legends of the synthetic blinker fluid... I've tried finding it at local stores but have yet to discover them..


Originally Posted by JS + BRZ
Would this clean up the carbon deposit in my Avant?
I do a 50/50 mix of blinker fluid and dawn soap to clean up the carbon deposits.

Originally Posted by SuperTrooper169
Yes it will. Pour the entire bottle into your windshield washer reservoir and top with a 50/50 mix of lacquer thinner and distilled water, then proceed to drive it like you stole it. Should clean out the carbon deposits and give you a few extra ponies under the hood.
don't listen to this guy, he's trying to ruin your car.. you don't put blinker fluid in the windshield washer reservoir... I put this in my resevoir, I heard it's very effective at cleaning the windshield
Old 10-07-2015, 08:30 AM
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Originally Posted by thoiboi
Oh man.. I've heard only legends of the synthetic blinker fluid... I've tried finding it at local stores but have yet to discover them..



I do a 50/50 mix of blinker fluid and dawn soap to clean up the carbon deposits.



don't listen to this guy, he's trying to ruin your car.. you don't put blinker fluid in the windshield washer reservoir... I put this in my resevoir, I heard it's very effective at cleaning the windshield
Hey, if it cleans injectors and valves, just think of how well it will get rid of those stubborn stuck on bug splats!
Old 10-22-2015, 01:43 PM
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eats windshield.. problem solved.
Old 10-23-2015, 08:42 AM
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I put 710 liquid in my engine
Old 10-27-2015, 10:41 PM
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You can use ATF in an engine for it's detergent properties for a very short duration. Typically it's used in engines that haven't been turned over for a while to help make sure nothing goes wrong when it's cranked by hand a few times to make sure it's all good.
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