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00:00:01
shop. And in today's video, we're going00:00:03
to be testing an old school mechanic00:00:05
trick or a hack you might call it, to00:00:08
see if it actually works. So, you might00:00:10
have heard an old greasy mechanic that00:00:12
usually lives in the back of the shop,00:00:13
missing teeth, addicted to cigarettes00:00:15
and alcohol, say that transmission fluid00:00:18
can actually clean intake valves, the00:00:20
top of the piston, clean out the whole00:00:22
entire engine, and even clean up fuel00:00:24
injectors just by pouring this directly00:00:26
into the engine and letting it kind of00:00:28
hot soak, and it will clear everything00:00:30
out. Now, I want to put that to the test00:00:32
today. This is the transmission fluid00:00:34
I'm going to be using today. It's Dexron00:00:36
and Mirkon. Uh it's ATF mix and we're00:00:39
gonna be running three different00:00:40
experiments today. One of which is going00:00:42
to be through the intake. Then we're00:00:44
going to put some into the fuel system00:00:46
and then finally into the engine oil.00:00:49
We'll see what happens in each test. And00:00:51
by the end of the video, we can compare00:00:52
our before and after for each single00:00:54
test that we run. So, it's going to get00:00:56
smoky00:00:59
and it's going to get messy. But let's00:01:01
see what's real and what's just plain00:01:03
shop BS. So, this 1999 Toyota Camry is00:01:06
going to be the test subject today. I'm00:01:08
going to get the hood off and I'm going00:01:09
to get a few parts off so we can00:01:11
actually get a camera in there and see00:01:13
the before condition before we do all00:01:15
these tests so we kind of have a good00:01:17
base to go off of and then we will00:01:18
recheck afterwards. So, I'm going to00:01:20
pull the valve cover so we can kind of00:01:21
see what the top engine looks like00:01:22
before we put the stuff in the engine00:01:24
oil to see if it actually cleans it. And00:01:26
I'm also going to stick a camera in each00:01:27
spark plug tube to see the carbon00:01:29
buildup on the piston and the valves.00:01:31
And that'll kind of give us a good base00:01:33
starting point of what this engine looks00:01:36
like now versus all the tests we're00:01:38
about to run. So, let me get this hood00:01:39
off there. Now, we got the hood off. So,00:01:40
now we can actually see what we're about00:01:42
to do right now. We got some good00:01:44
lighting. And this engine has 285,00000:01:47
mi on it. So, it better have some carbon00:01:49
in it because it actually looks like a00:01:51
pretty decent engine so far. Uh,00:01:53
testament to Toyota Camry's pretty dang00:01:56
good vehicle. So, let's pull this valve00:01:57
cover off, get the spark plugs out.00:01:59
We'll get the camera in there and we00:02:00
will see what our starting point looks00:02:02
like. And then we will start with our00:02:04
experiment number one,00:02:08
[music]00:02:09
not for impact use.00:02:14
[music]00:02:15
Now, with the valve cover off, we can00:02:16
see that this thing does have carbon00:02:18
buildup on it, which is a good thing00:02:20
because 285,000 mi, but it's not as00:02:23
terrible as some may think with this00:02:25
kind of mileage on it. Here's what I'm00:02:27
looking for. Will the transmission fluid00:02:29
clean up some of these deposits all on00:02:31
the cams here on the back of it by the00:02:34
by the lifters back there? If I scrape00:02:36
away at the top of the cylinder head00:02:38
here, you know, I can get some carbon00:02:41
buildup that's on the back of my00:02:43
screwdriver there. So, will it clean00:02:45
some of this stuff off of the top here00:02:47
and off of the cams by cycling it00:02:50
through? I don't know, maybe we do half00:02:51
hour, hour, give or take, and then we'll00:02:53
pull the valve cover off for that test.00:02:55
Now, I also want to get a good visual of00:02:57
each and every spark plug hole so we can00:02:59
get a good picture of the intake valves00:03:01
and see what they look like. Hopefully,00:03:02
they got some carbon buildup on them.00:03:03
You can see that the top of the piston00:03:05
definitely has some carbon buildup on00:03:06
it. Let's see if we can get a good angle00:03:08
at the valve here. Oh, there you go.00:03:10
That's a perfect picture.00:03:12
Look at those intake valves. So, that00:03:14
definitely has carbon built up on it.00:03:17
So, if we run this through the intake,00:03:19
will that clear the carbon off these00:03:20
valves and clean up the top of this00:03:22
ridge right here? You can see where the00:03:24
top of the piston doesn't meet uh on00:03:26
this edge here. So, real close. All that00:03:29
is carbon buildup as well. So, if we run00:03:31
it through the intake, will it clean00:03:32
that as well? And I'm also going to run00:03:34
some through the fuel. So, hopefully00:03:36
that cleans the injector. And this might00:03:39
actually clean some of that up, too, as00:03:41
well. So, those are two tests that we're00:03:43
going to try that should remedy some of00:03:45
this. Let me just get a picture of each00:03:47
thing. And I'm going to get a picture on00:03:48
every single cylinder so we can do a00:03:50
before and after. All right. And then00:03:52
one other visual I want to get is the00:03:54
intake because we're going to be running00:03:55
a lot of this transmission fluid through00:03:56
the actual intake manifold. I want to00:03:58
see if it'll clean that as well. And you00:04:00
can see by the throttle plate that ain't00:04:02
looking very good. So, let's just open00:04:04
up that throttle plate and get a couple00:04:06
of visuals on the inside. And that's uh00:04:08
the inside of the intake. Look at all00:04:10
the carbon buildup in there. That is00:04:12
horrendous. So, we're going to take a00:04:14
few uh So, we're going to take a few00:04:16
photos of that as well. That looks like00:04:18
volcanic ash. That is awful. couple of00:04:21
photos of that as well. So, now let's00:04:22
wrap this thing back up, get everything00:04:24
reassembled, and then we'll start on00:04:26
test one, which is going to be running00:04:27
the ATF through the intake manifold to00:04:30
see if it clears out any of the carbon00:04:32
deposit, and then we'll try the fuel,00:04:34
and then we will put it in the engine00:04:36
oil. And before I put these spark plugs00:04:37
back in, might as well just get a good00:04:38
visual of what these look like before,00:04:40
cuz we might follow one of these out.00:04:42
Little bit of carbon buildup. This one's00:04:43
got some deposits on it. You can see00:04:45
right here.00:04:47
Probably tough to see with the camera,00:04:48
but regardless, let's get back to00:04:50
reassembling this thing. Okay, now00:04:51
everything is back buttoned up. We're00:04:53
going to do the very first experiment,00:04:55
test number one, and we're going to run00:04:57
ATF through the intake manifold. We're00:05:00
just going to find a vacuum line,00:05:02
probably just right here on top of the00:05:03
EGR, and we will suck this into the00:05:06
intake. I'm going to let the engine get00:05:08
nice and hot first. So, hopefully this00:05:11
is a true and tried fix, but we will see00:05:14
with test number one. And this is the00:05:17
vacuum hose I'm going to use, which I00:05:18
just broke, which is kind of a bummer.00:05:20
And I'm actually going to back this00:05:21
thing out because I know it's going to00:05:23
smoke. So, first up, I wanted to make00:05:25
sure that the engine was nice and warm00:05:27
and at operating temperature. So, I gave00:05:29
it a few revs here until it was nice and00:05:32
warm before I put any of that ATF into00:05:35
the intake manifold. You can see it's00:05:36
nice and warm. Now, the EGR valve line00:05:39
didn't give me enough vacuum, but this00:05:40
brake booster line did. And this is the00:05:43
fluid that I'm going to be dumping right00:05:44
into this line. Now, you have to do this00:05:46
super slowly because if you dump it in,00:05:47
you could hydrolock the engine, and that00:05:49
would be really bad. Now, I'm just going00:05:51
to repeat the cycle a few more times to00:05:53
get it nice and coated in that intake00:05:55
manifold with some ATF. Then, she should00:05:58
begin to start a little bit of a smoke00:06:00
show. And as you can see out the00:06:02
tailpipe, now we're starting to smoke00:06:03
pretty dang good here. So, we're getting00:06:06
nice and coated in that intake man. And00:06:08
I wanted to make sure I had the intake00:06:10
nice and coated, so I found a front00:06:11
vacuum line, too, to use as well. And00:06:14
now I'm going to let it sit for a little00:06:15
bit. I'll run it one more time after it00:06:17
hot soaks and then we [music] will put00:06:19
it back in the shop and we will see if00:06:20
it cleaned any carbon out of the intake.00:06:22
All right, so we're back in the shop00:06:23
now. The car is in the shop. And that00:06:25
was like 45 minutesish run time, about a00:06:28
quart of ATF. And I did it through both00:06:31
little hoses of the intake here. Uh00:06:33
through this hose here and this one back00:06:35
here. I wasn't getting much vacuum out00:06:36
of this, so I don't know if it's just00:06:37
plugged up or what. So now let's take00:06:39
the snorkel off. We'll stick the camera00:06:41
back in it and we will see. Did it clean00:06:43
up anything? And I will compare the00:06:45
before and after. All right, so first00:06:46
things first. This thing was pretty00:06:47
gummed up, so I'm not sure we're going00:06:50
to see much from the inside here.00:06:54
It's kind of hard to tell. Let me stick00:06:56
the camera in it once. All right, so00:06:58
first things first, there is some00:07:00
cleaning on the deposits here. So, this00:07:02
might actually00:07:04
uh be working. It might actually be00:07:06
looking pretty dang good in here.00:07:08
Hopefully the camera's picking that up.00:07:10
So, let's take a picture here.00:07:13
Get a shot there. Stick this camera back00:07:15
in a little further. Yeah, look at this.00:07:17
The actual big deposits of carbon uh00:07:21
actually came right off the side of this00:07:22
intake. So, the uh ATF, I'm going to say00:07:26
this is actually working. You can see00:07:27
there's a ton of it in there. Uh I bet00:07:29
you if we continue to get this thing hot00:07:32
and did it a few times, we could get00:07:34
some of this carbon to break free from00:07:36
this. So, test number one, I'm going to00:07:40
say, yeah, ATF in the intake will clean00:07:43
the intake. Um, it's probably even clean00:07:47
the valves, too, if I got the camera00:07:48
down on the spark plugs. Why don't I do00:07:49
that quick? I'll just get a part a plug00:07:50
out and just look. I got one and two00:07:52
spark plugs out of the hole now. Uh,00:07:54
number one's pretty close to top dead00:07:56
center, so it's kind of hard to get the00:07:57
camera in there, but you can see the top00:07:58
of the piston. You can see it's uh it00:08:00
started to clean it just out of the out00:08:03
of the intake valve. You can see the the00:08:04
edge right there. All the little specks,00:08:06
those are pieces of carbon that came off00:08:08
the piston. And yeah, you can't really00:08:09
turn it around in there, but let's put00:08:10
it in cylinder number two. You can see00:08:12
right here, it started to clean up on00:08:13
this edge of the piston. And then right00:08:15
here, it actually started to get pretty00:08:16
shiny, too. But let's look at the00:08:18
valves. You can see the cylinder head00:08:21
right here. It actually started to clean00:08:23
it up a little bit.00:08:25
And uh yeah, the valves the valves are00:08:28
still pretty00:08:30
carboned up looking, but it looks like00:08:32
some chunks maybe have come off of it.00:08:34
All right. And now all this is a clear00:08:36
indicator that this will actually remove00:08:38
carbon from your intake manifold, the00:08:40
tops of the piston, and the valves. I am00:08:42
going to put it in the fuel system, too.00:08:44
I'm going to put a little bit in the00:08:45
fuel. Uh that's probably going to take a00:08:48
little longer. I don't know if we're00:08:49
going to notice anything different on00:08:50
that, but if you do run it through the00:08:51
intake, uh this is a clear indication00:08:54
that it is working. And I do want to run00:08:56
it in the engine oil. So, maybe in00:08:57
conjunction, we'll uh we'll put it in00:08:59
the engine oil. I'll put it in the fuel00:09:01
system as well. We're going to kind of00:09:03
conjoin those two uh tests and we will00:09:06
see what actually happens because I'm00:09:07
going to run it to you for I don't know00:09:09
maybe 35 minutes, 40 minutes. There's00:09:11
not really a telltale sign on this, but00:09:13
let's do that. We'll change the oil00:09:15
quick. We'll put ATF in the oil. I think00:09:17
some people said just adding a quart can00:09:19
help. Uh I might uh try a little00:09:22
different thing and do the whole engine.00:09:24
Uh so hopefully we don't wreck anything00:09:26
before we can see anything. So let me00:09:29
get to it. I'm going to drain the oil00:09:30
quick and then we will put ATF in it and00:09:33
then uh in the fuel system as well.00:09:35
We'll run it for I don't know give or00:09:36
take 35 minutes and we'll tear00:09:38
everything back apart. Pull pull that00:09:39
valve cover off and see what we can see.00:09:42
Get this oil drained quick and we will00:09:46
top it up and we will see what the00:09:48
result will be.00:09:52
Nasty. All right. So test number two is00:09:55
going to be transmission fluid in the00:09:57
fuel. And we're just going to do the oil00:10:01
and the fuel together. We're going to do00:10:03
one quart in the fuel tank.00:10:07
And then next up, test number three.00:10:09
Fill the engine up. I'm just going to do00:10:11
the whole engine with ATF. And I don't00:10:14
know if this is going to be a really bad00:10:15
idea, a really good idea, or what. Uh,00:10:18
like I said, I think I've heard in the00:10:20
past, one quart uh, replacement and then00:10:23
you change it. I think this holds four.00:10:25
So, let's get this filled up with00:10:26
transmission fluid. We'll back it out00:10:28
and I think I'm going to run it for,00:10:30
like I said, probably 45ish minutes. And00:10:33
then we'll come back in. We'll drain the00:10:35
fluid and we will pull the valve cover.00:10:36
And let's see if the magic happens.00:10:41
And you can see there's transmission00:10:43
fluid. Uh, I'm going to stop there. It's00:10:45
basically full. The only thing I didn't00:10:47
change is the oil filter. Uh, I don't00:10:51
think I really need to, to be honest.00:10:52
This thing doesn't really hold that much00:10:53
oil. All right, let's get this thing00:10:56
fired up, back it out, and let it run. I00:10:58
got the timer here set to 45 minutes.00:11:01
We're starting now. Let's fire this00:11:04
thing up.00:11:09
Still starts. That's a good sign. back00:11:11
it out cuz it's probably going to smoke00:11:13
again with the uh fuel and the uh yada00:11:15
yada. And then in 45 minutes, we'll come00:11:18
back and we'll pull it in. We'll drain00:11:20
the oil. It's only been like 10 minutes,00:11:22
but look at this top of the dipstick.00:11:24
Hopefully I can see that. Let me zoom00:11:26
in.00:11:27
There's carbon actually on the tip of00:11:29
the dipstick right now. So, uh clearly00:11:33
it's falling apart in there, which00:11:35
hopefully we don't plug up any oil00:11:36
galleries or anything. And uh I just00:11:38
figured I'd show this. This is the00:11:39
engine oil I took out. I'm going to get00:11:41
this drained and cleaned up so we can00:11:44
catch that other oil. But this is pretty00:11:45
murky looking oil, too. Hasn't been00:11:48
changed in quite a while, obviously. But00:11:50
I figured I'd show that so we kind of00:11:52
knows what the old oil looks like uh00:11:54
before we drain this transmission fluid00:11:56
back in here. All right. And our timer00:11:57
is just about up here.00:12:00
And00:12:02
she is done. So, let's pull it back in00:12:06
and see what the results will be.00:12:11
All right. So, first things first,00:12:14
take a look at that oil.00:12:17
Smells pretty dang bad.00:12:20
You can see it turned from red to brown,00:12:23
which obviously it's mixing with the00:12:24
engine oil. Let's pull the plugs out now00:12:27
and we'll take the valve cover back off00:12:30
and let's just see if it kind of cleaned00:12:31
up the top end of the engine. and then00:12:33
we'll stick the camera down in and see00:12:34
if we notice anything difference with,00:12:36
you know, a good 45 minutes of run time00:12:38
on this. All right, now I have the valve00:12:40
cover removed.00:12:42
And, you know, it doesn't look that much00:12:44
cleaner. You know, where I scraped right00:12:46
there, you can kind of see maybe maybe00:12:48
it started to dig in because it had a00:12:50
way to get into the the crevice. It00:12:53
looks like some of it back here maybe.00:12:54
Uh, let me grab a light. Looks like some00:12:56
of the carbon back there maybe have come00:12:58
off. We'll have to do a before and after00:13:00
comparison. uh put some of the beginning00:13:02
video on compared to it, but uh you00:13:06
know, clearly it is cleaning it. I can00:13:08
see that it is cleaning it. Um and this00:13:12
might be not the smartest decision on00:13:14
especially newer engines. Just in the00:13:16
event that carbon breaks apart and gets00:13:19
stuck in oil galleries and stuff like00:13:20
that, uh you might do some oil00:13:22
starvation, which won't be the greatest00:13:24
thing. I think the biggest thing I00:13:26
noticed so far was with the intake, you00:13:28
know, running it through the the intake,00:13:30
cleaning the carbon off the valves and00:13:31
stuff. Let's pull the spark plugs out00:13:33
and get the camera back in there and see00:13:36
if we see anything notable now that we00:13:37
had the fuel injectors running the, you00:13:39
know, transmission fluid and burning it00:13:41
as well. First off, let's get a look at00:13:43
the valves00:13:45
and the pistons.00:13:48
Um,00:13:50
if you could just find a hole there,00:13:52
bud. That piston is actually getting00:13:54
pretty dang clean. You can see the the00:13:57
chunk right there of carbon that's00:13:58
coming off this thing. Uh see if I get a00:14:00
look at the valve. You can see the00:14:02
little uh ring ridge right here. That00:14:03
carbon that builds up on that thing. Uh00:14:06
that's um that's actually getting clean.00:14:09
So that's working. Um let's see if I can00:14:11
get this down in there and see those00:14:12
valves. Yeah, look at that. You can00:14:14
actually start to see some shininess on00:14:16
the valves here. This would be the00:14:18
intake valve right here. And then the00:14:20
chunks right there. But even the top of00:14:22
the cylinder head. Look at that. It's00:14:23
starting to clean it up pretty dang00:14:24
good. This is actually a confirmed uh00:14:27
way to clean carbon. This would actually00:14:29
work. So, if you hear the old fogies out00:14:31
there saying this, uh, this trick works.00:14:34
They're definitely right. This trick00:14:36
definitely works. Uh, there's a lot of00:14:38
good properties in ATF that does a great00:14:42
job cleaning. I mean, open up a00:14:43
transmission once and you'll see for00:14:45
yourself how clean they can be if it00:14:47
hasn't been beat to the the gardens.00:14:49
Now, at the end of the video, I'll just00:14:50
uh link all the pictures that I took,00:14:52
the before and afters of each cylinder,00:14:53
because I did just get another photo.00:14:54
But let's just take a peek one more time00:14:57
in the intake manifold. See if00:14:58
anything's kind of cleaned up since uh00:15:00
the last time cuz we ran it for another00:15:02
45 minutes. Right now, the intake, it's00:15:04
kind of looking the same that it did.00:15:06
There's still carbon. You can see00:15:08
there's like, you know, the big chunks00:15:09
of carbon and stuff that fell off, but00:15:12
obviously we're only bringing in the00:15:13
fluid at uh one vacuum source. So maybe00:15:16
the fluid's coming through and like00:15:18
hitting against the intake here and then00:15:19
sucking into the cylinders. Kind of hard00:15:21
to say. Let's try to get it down one of00:15:24
the runners here. Kind of tough to see,00:15:26
but this is down a runner. Um you can00:15:28
see up on the top here, it's kind of00:15:29
getting kind of getting some stuff00:15:31
cleaning. It is it is doing somewhat of00:15:33
a cleaning, but it's still pretty00:15:35
carboned up. Uh this engine had a ton of00:15:37
carbon in it and rightfully so with the00:15:40
mileage that's on it, you know, 285,00000:15:43
mi. Let's get this thing in the air and00:15:45
we'll drain the oil just to see what the00:15:48
condition of that oil looks like now00:15:49
with transmission fluid cycle through00:15:51
it. All right, I got this pan pretty00:15:54
much cleaned up the best I can. This00:15:55
will be interesting. Let's see what it00:15:57
looks like. It's kind of tough to see,00:15:58
but it's got a lot of particles in it. I00:16:02
don't know if that's uh a good thing or00:16:03
a bad thing. Like if it's, you know,00:16:05
removing it from stuff that was stuck in00:16:07
the engine or if I just removed a bunch00:16:09
of bearing material using this fluid. I00:16:12
just idled it, too. I didn't really run00:16:14
it so it was like super high in the00:16:15
RPMs. I didn't really want to risk00:16:17
anything exploding on me here quite yet.00:16:20
I just wanted to see what this would do.00:16:22
It's kind of difficult to see from the00:16:23
camera, but look at the cup. I mean, it00:16:25
definitely seems like a lot of debris00:16:26
did come out of the engine. Again,00:16:28
long-term running this thing, I don't00:16:30
know the implications of what the00:16:32
bearings can handle and stuff uh by00:16:35
having this fluid in there. Look, look00:16:38
at the cup. It's turning [clears throat]00:16:39
like black. Yucky. Well, there you have00:16:42
it. I'm going to say experimenting with00:16:44
the ATF here to clean up carbon inside00:16:48
the engine and your valves and your00:16:49
intake and yada yada. I'm going to say00:16:52
it's a confirmed hack. Uh it does00:16:55
actually work. It does actually get the00:16:56
carbon off the intake and the valves and00:16:59
the top of the piston, all that stuff.00:17:01
Uh running it through the engine, I00:17:03
don't see as much of a uh result, I'll00:17:06
call it. Um maybe a little bit of00:17:08
cleaning that was done. Maybe if I ran00:17:10
it longer, too. I just really don't know00:17:12
how long I should even be doing this00:17:13
test, to be honest. But I did see a00:17:16
actually a pretty dang good improvement00:17:18
on the intake. I mean, if you did this a00:17:19
few times for the intake, uh guaranteed00:17:22
this thing would start to look pretty00:17:23
dang clean on the inside. Plus, there's00:17:26
a lot of carbon buildup. Uh and you00:17:28
always got to be worried about those00:17:29
deposits breaking off and going00:17:31
somewhere that it shouldn't and plugging00:17:32
something up cuz that would be no bueno.00:17:35
But hopefully the rest of you gear heads00:17:36
out there found this kind of00:17:38
interesting. I didn't really know where00:17:39
the experiment was going to take me, but00:17:41
here we are. If anybody out there00:17:43
watching this knows something that would00:17:44
be cool to run through this engine, I'm00:17:46
going to be junking the dang thing00:17:48
anyways. So, if you got some ideas, I00:17:50
don't know what hasn't been done. I want00:17:52
to do something that's kind of unique.00:17:53
Uh, you know, run it like on olive oil00:17:55
or something stupid, right? Uh, if you00:17:58
think of something, shoot me a comment00:17:59
below and maybe I'll try to make a video00:18:01
on it. Be kind of fun to do. Uh, until00:18:03
then, like, subscribe, and hopefully you00:18:05
guys are tuning into the next video.00:18:08
Take care.00:18:11
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>> [music]Description:
Old-school mechanics swear that transmission fluid can clean carbon, fuel injectors, and even sludge inside your engine. But does it really work — or is it just a smoky myth? Today, we test three classic ATF tricks to find out. Here is a link to the Boroscope everyone asks me about - buy it here - https://www.amazon.com/Articulating-DXZtoz-Industrial-Articulated-Inspection/dp/B0B28HRSBP?dib=eyJ2IjoiMSJ9.67iwLs10UidGkrl1H3mwnFZsCshcxoS-8ULaYQ2bzoP5PkiR_ifogHswURPgM0i-tjFbbLv4i-IergO7XiRP3Q5zewDACdoHQIvX311Rl_Yz0Xq65TXTBXp_cikZTgBVMVXf_ORZNgIJjiDBhUcWxe39DoI28I0e8m1NEGnRA4EPTFuGvjvdDj0cPg8KsN7-uX4Jwre-0BlXbQIw6qcmsF1stK3OIoxdPcUl0CBsv_U.TRHoALbgvdM-vfA8irqdmPfmEaDWaBLXHkVMgAVAi1w&dib_tag=se&language=en_US In this video, I test three old mechanic myths that all use transmission fluid (ATF) to “clean” your engine. We’ll test it through the intake, in the fuel, and in the oil to see which ones actually work and which ones are just garage legends. You’ll see how ATF burns in the intake, if it affects idle or performance when mixed with gas, and finally — whether it actually removes sludge when added to your oil before an oil change. 🧰 Tests Performed: 1️⃣ ATF through the intake (carbon clean trick) 2️⃣ ATF in the fuel (injector cleaner myth) 3️⃣ ATF in the oil (pre-oil change flush) 💬 Have you tried any of these? Comment below which old mechanic trick you want me to test next! 🔧 Subscribe for more DIY car experiments, mechanic myth-busting, and real-world tests!
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