Please Stop Doing This to Your Transmission (It Destroyed My Car)

Please Stop Doing This to Your Transmission (It Destroyed My Car)

rev up your engines today I’m gonna tell
you why you should flush the toilet in your house but not flush the
transmission in your car now for the last 52 years people are asking me
Scotty somebody’s trying to tell me I need to flush my automatic transmission
have it all flushed out and new fluid put in is that a good idea and I generally say no it’s not a good idea now the reasoning behind flushing isn’t
a bad idea realize most automatic transmissions
when you drain the pan take it off empty it out maybe three four quarts of fluid
comes out and some of these systems hold like 14 15 quarts so a bunch of the old
fluid remains inside especially inside the torque converter because it’s not
like flushing your radiator system out which is much simpler now radiators have
tiny halls that the coolant has to go through you want to keep it clean so
that all those passageways don’t get clogged up and the cooling system is
very simple you got a radiator and flows through you have a water pump that pumps it through the system goes through the jackets of the engine inside to take the
heat from the engine and then pump and dissipate it through the radiator simple
system you don’t want to clogged up a mechanical or in some cases the new ones are electric pumps they still just pump the fluid so you flushed it out you get
all the crud out you’re not gonna have any problems but automatic transmissions completely different animal here automatic transmissions are very complex inside they have electric solenoids they have tiny little passageways that go by
pressure differential you have dirt in your automatic transmission and you run
a power flush that’s power pushing the fluid through the system those tiny
little holes some of the crud could be pushed into the little holes jamming
them up I have seen hundreds of people have the transmission flush somewhere
else they bring it to me and say Scotty my transmission is slipping now or it
won’t go into gear or shifting rough and it wasn’t doing it before I had the
transmission flushed and it’s true that can easily happen the best thing to do
is to drop the transmission pan clean it all out and check
the filter the filter is there to catch most of the crud so you dropped the pan
clean the dirt out in the bottom put a new filter in then the system is good to
go if you do it regularly no when I was a young mechanic in the nineteen sixties
we would change the transmission fluid and filter every thirty thousand miles
the fluid wasn’t as good the transmissions weren’t as good and it had to be done more often now today the transmissions are better the fluid is
better I would still change it every sixty thousand miles or so in any
vehicle and for heaven’s sake don’t listen to those people that say a lot of
transmission fluid in a modern car its lifetime fluid you never need to change
it then your ask an engineer what does a lifetime fluid mean and an honest one
will respond well it means that the fluid is good for the lifetime of the
transmission well ask about the warranty is usually it’s sixty thousand miles or
something hey I don’t want to transmission that after sixty thousand
or eighty thousand miles goes out maybe the fluids go good
theoretically but if the transmission isn’t shifting and you got to spend four
or five grand for a new one or have it rebuilt not a good idea
my old Celica it’s got two hundred thirty thousand miles and the
transformation still shifts like a dream mind you I change the fluid every 30,000
miles not that big of a deal I don’t even worry about the filter and that’s
because these toyota designs a lot of them don’t have an actual filter they
got a little screen just like a mosquito screen on the windows of your house you
just clean them you don’t have to replace them because there’s not that
much animal because realize transmission fluid is cheap transmission rebuilds and
new transmissions are very expensive you don’t want it to go this far you don’t
want a transmission that Revs way too high before it starts shifting gears
that’s a no-no you don’t want to transmission that herky-jerky when
it’s taken off or slips when you’re trying to take off and you don’t want to
transmission that you put it in reverse and you step on a gas and it won’t move
anywhere these are all signs that you have a transmission problem you want to
avoid this at all costs let’s say you let it get really dirty never changed it
at all then if you try to flush it all that crud is thrown through the systems
as I said theoretically it sounds like a good idea you’ll flush all the crud out
of the system and have brand new fluid in but it often doesn’t work that way
not only because stuff can get clogged up but an old transmission that’s worn
they are run by friction the fluid has friction in it and the fluid friction
helps the dynamics of making the car move down a road guess what really dirty
fluid actually has more friction in it so if you change your transmission fluid by
flushing it and you get all the dirty friction fluid out put a new slippery
shiny brand-new fluid guess what a lot of times the transmissions will start to
slip now to counteract that on it really all transmission let’s say the
transmission needed a shift solenoid and had to drop the pan real pro mechanics
like myself they will save the old fluid and put it back in so it won’t have that
problem now that might sound like a stupid idea
check out the old fluid replace broken parts then put that old fluid back in
got a car that’s got 150 200 thousand miles a lot of times that is the smarter
way to go with that kind of mileage you’re off and living on borrowed time
and your borrowed time and it goes way down to nothing if you put in fresh fluid from
really all dirty fluid so why does some mechanics and shops tell you oh we’re
gonna flush your transmission fluid well there’s two main reasons for that and
numero uno is it’s a profit-making thing it’s like guys that say oh we have to
power flush your injection system if your car’s running perfectly finding out
no problems a lot of times that’s just over selling something to people and
flushing the transmission fluid it’s an often oversold item and number two it’s
very easy for a shop to do it that has the equipment you’re gonna change the
filter and fluid you got to drop the pan a lot of the modern transmission pans
don’t even have gaskets they’re glued on and let me tell you it is a job getting
that all glue off without breaking anything you gotta hit and pry and pull
it’s messy you gotta buy a filter then you got to fill it all back up but with
the pressure machine automatic transmissions have cooler lines on that
go to the radiator or to a special cooler all I gotta do is take those two
lines off hook it to their machine and flush it through it’s a very easy thing
for them to do with the equipment and as most guys charge more money to flush a
transformation then it just drop the pan and change it they’re making more money
not a good idea to have an automatic transmission flushed now yes you want to
have clean fluid but if you change it off and that’s good enough yeah you’re
not changing at all you’re changing some of it but you’re changing it off that if
you keep doing it and if it has a filter and you change that filter it’s gonna
get rid of any problems that you’re gonna have in the first place and that’s
especially true in modern cars because the new cars most of them use a full
synthetic fluid that fluid lasts longer if you’re just changing a bit at a time
maybe a third at what’s in it when you just change the filter and fluid the old
fluid mixed with the new fluid it doesn’t have the degradation that the fluids did
when I was a young mechanic in the 60s and they just flat wore up plus the
transmissions are so much better made than they used to be back in a day
almost all the American automatic transmissions they had automatic
clutches inside that’s why we called them automatic transmissions and they
would shed a lot of clutch material and that clutch material made of asbestos of
course it’s gonna clog stuff up well they don’t make them like that anymore
so you don’t have to worry about the gross contamination that the older ones
are getting if you didn’t change them a lot you’re gonna have serious problems
but today no the designs are better the fluids are better so you should stay
away from watching them now as far as I’m concerned there’s only one exception
to this rule of not flushing let’s say you got a vehicle and it won’t even go
down the road or it slips so bad then it’s almost un-drivable
what the heck if you want to take a gamble somebody hooking up a machine and getting all the crud out of the system especially an American automatic
transmission you might give it a try if you say that hey it’s gonna cost you
three four grand to have a rebuilt transmission put in and it’s an old car
that’s all worn out and it’s slipping like mad or doesn’t even move what the
heck you might give it a try just to see if it’ll work and sometimes it will
work I’ll say 25-30 percent of the times that I’ve seen it happen like that
they went back to at least drivability they could go down the road okay maybe
they still slipped a little or they clunk a little but you could actually
drive it one before the flush you couldn’t but that’s an extreme case of
an extreme junker worn-out vehicle don’t think that if you got a modern vehicle
that’s got 60 70 thousand miles and it’s a poor design and transmission slipping
or shifting weird that flushing is going to help that at all because realize that
automatic transmissions are very complicated and very sensitive to fluids
differential pressure to the friction that’s inside them it’s not like engine
oil okay you’re driving a car your engines firing gasoline explosions
there’s all kinds of after-effects of the burning and water vapor that get
into the oil and contaminated so that’s just got to be changed at least once a
year or every five six thousand miles in most cases and yes modern automatic
transmissions they’re sealed units get on that explosions and water and stuff
going inside them they are sealed as long you don’t go under water and air
from the transmission bubbles out water takes its place when it’s underwater
because there isn’t the build-up like there isn’t an engine but over time you
don’t get some build-up just from friction things wearing pieces coming
off inside so you do want to change the fluid cloud maybe every 60,000 miles or
something in a modern car but please listen to scotty don’t get suckered into
being sold a transmission flush job because then you ain’t need a
transmission overhaul job shortly after that you just weren’t prepared for
especially if you had a transmission that shifted perfectly fine in the first
place and then it’s starting to act up after the fluid,
so here the key to having a happy smooth running transmission is keep it clean by
regular oil and filter changing but not by the radical process of flushing it
with a power machine, so if you never want to miss another one of my new car
repair videos, remember to ring that Bell

100 thoughts on “Please Stop Doing This to Your Transmission (It Destroyed My Car)

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  2. What about sealed transmissions, been told the only way to change fluid is to flush it. Advised you can’t drop pan or change filter on newer sealed transmissions

  3. My truck has 305K on it… orginal transmission, original fluid, still shifts fine. I'm terrified to even pull the dipstick out and jinx it.

  4. Scotty, I have a misubishi montero 2001, SR, it have 232,000 miles, and I do the oil change every 30,000 since the first change with the power machine (just the oil change) no the liquid to washed, and I never change the oil filter, and it runs like new, the last time, they did it changing the oil through the hole of the dip stick with a new machine, when I saw that, I didn't like it, because I always use to do it, disconnecting the cooler and that doesn't make any sense to me, the machine extracts oil and then put new, repeating that e few times until it "change the oil" completely, I saw the dirty oil in the pan, but I don't see how that procedure can change the oil as the other way (disconnecting the oil cooler). Thanks

  5. My '94 Camry's auto (190,000 kms) was slipping when cold, sometimes finding a false neutral; then only working properly once fully warmed up. I decided to get the transmission and the torque converter flushed and replaced with new (Toyota brand) ATF. Now the auto box runs perfectly, no slip, no problems. Sometimes flushing the transmission is just what's needed.

  6. Thanks for explaining that Scotty! I knew about this years ago, and when I bought my older, high mileage (240K+) Country Squire, the transmission was running fine and it was reccomended I flush the fluid. I didn't and years later it was still working great, towed a trailer through the mountains when I moved from California to Portland, no problems. I know transmissions on the Crown Vics can be bad sometimes, but I figured that if it was still running after all those miles – don't mess with it! Now I know why 🙂

  7. just had an oil change at Subaru for my 2008 forrester with 80k miles….the service guy shows me a tube of dirty fluid, we need to flush your Trans…..yeah…well, I heard its not a good thing…He says, we do it all the time, it will be fine….right…..

  8. Hay Scotty azeem here I have a 2007 Toyota Sienna van with a little over two hounded thousand miles transmission oil never change it drives and shift good do you think I should change the oil

  9. Scotty, what do you mean by old fluid has more friction in it then new fluid? I would think that newer fluid is thicker and therefor would provide better protection against metal on metal friction.

  10. Every 50,000 with spin on filter on my Allison. Just tipped 300,000 with 0 issues. I totally agree with regular fluid and filter changes, save you a ton of money in the long haul..

  11. As he said in another video, reverse is often the first gear to wear out. Sure enough that's exactly what happened to me a few years ago after 185k on the Camry. The other gears shifted perfectly, but they found other parts to replace while it was apart. I could've gotten a Toyota remanufactured tranny for the same price I paid to have it rebuilt.

  12. Dead on Scotty, change the fluid not flush. But GOD do change it. IT will make the tyranny life longer from what I know. Correct me if I am wrong.

  13. Refer to your OWNER'S MANUAL for the required maintenance. But use the severe duty maintenance schedule if you plan on keeping the car.

  14. My truck just hit 30,000 miles and I’m getting my transmission fluid exchanged at the dealer on Friday. Should I go ahead with it or cancel the appointment?

  15. Gee, you're right; I don't want a transmission that 'revs way too high before it starts shifting gears', or is herky-jerky on takeoff, or slips, or doesn't let the car move after being put in reverse. It's nice not having a transmission at all.

  16. Too bad I had not wached & followed Scotty's advice before flushing my car's transmission; I ended up clogging the toilet up in my house!

  17. I usually buy new cars. Change the auto Trans fluid every 40 thousand miles or 3 years. I've never had a single issue doing this.

  18. To me when a new car saids you never need to have the transmission oil changed , it means it is a disposable car. Drive it til it breaks then buy another new car to replace it.

  19. I need help with head gasket seal in a Cadillac eldorado v8 northstar do you trust products like blue devil @scotty Kilmer

  20. Gotta flush that toilet, give her a good ol scrub every once in a while (wax it once a season), maybe check out whats going on underneath the hood every couple thousand shits make sure she still shifts like a dream, no herky jerky garbling turkey.

  21. Flushed a tranny on an ‘84 300z turbo. Ran fine for a month then started slipping so back it became impossible to drive. Ended up selling for parts.

  22. I had a subaru wagon that was slipping and shifting high, changed the fluid, and it started working fine. Had 140,000 miles on it and the tranny fluid was black.

  23. My 99 ES300 has had transmission drain/fill with Toyota Type IV every 15k since 99. It used to be kinda slippy at low speeds until I put in a little less ATF during a drain/fill so that it's on the lowest end of the dipstick marking after a 25 minute drive.. now it's shifting perfectly. More friction from slightly less fluid? You're making me think it might be better to change it less often!

  24. Scotty just bought a 94 Camry with 82000 miles on it for 1500, should I still change the transmission fluid if it probably was never changed.

  25. I agree with only part of this, yes dont allow a company use a machine pressure flush machine, however you can use what my shop uses, it uses the vehicles transmission pump to change the fluid, mostly just trucks use a flush machine and most front and all wheel drive cars are only drain and fill, so similar to what he is saying you should do. Most shops I know dont use powered flush machines anymore and alot of newer cars dont even have a transmission filter to change out either. Also, I do agree with him about high millage car that never had a history of fluid changes, dont change it if its 200k + miles. Do the trans fluid changes at all recommended intervals, most drain and fill are around every 45-60k.

  26. Scotty, I have 56k miles on my 2015 Honda Accord. I've been putting serious miles the past year and a half. I bought the car used with 21k miles. (Yes I've put 35k miles in a year and a half) I love this car and want to prolong it's life as much as possible, this car has never had it's transmission fluid flushed, based off your video is it "too late" to start routinely doing the transmission fluid flushes? Should I just keep focusing on the engine oil only and drive it till it breaks down? Any help (from Scotty or anyone who knows is greatly appreciated)

  27. I change my transmission fluid every 15,000! I don't play games when it comes to my car! So, what if I'm wasting money! I'd rather spend a little now than a lot later!

  28. I was offered a transmission flush from the dealership while changing the fluid but I refused and that was the best decision I made for the car.

  29. Ty Scotty I just drained my 15 Hyundai wit new tranny fluid not flushed at 70k car drives much better and my Victoria power steering 5 times as u said that’s also working great quiet fluid was black now it’s clean in color ur my car god lol all hail Scotty run for President in 2024 and fix stupid in American cars

  30. Mr Scotty, is a flush and a fluid transfer the same? why were the flush machines made anyway if it was a bad thing to do? how do you feel about increasing the fluid capacity of a transmission with a deeper pan? thanks

  31. A month ago i flushed my transmission. They didn’t screw the drain cap on properly and the fluid leaked. Destroyed my transfer case a month later. $3000 job on a newish rav4 🙁
    Shouldnt have flushed it

  32. Power flush (or the T flush as they called it then) is what ruined the transmission on my 2nd ever owned car. I will never flush another.

  33. Scotty I drive a 2018 honda civic ext with the cvt transmission in it. On my transmission fluid the car has a indicator when the service is due. I'm a little over 40,000 miles in just a little over a year. Should I change it when it tells me or would you say take it to a shop?

  34. Really your kidding??? I have 2000 toyota tacoma. Original felt that original transmission fluid never added any fluid or changed any filter nothing 675000 miles transmission solid as a rock shifts to like a wet dream. Never no problems motor or tranny..

  35. Roommate said he was gonna drain all trans fluid and install new filter. Told him to save the old oil just in case… Well now that truck doesn't move an inch and he didn't save the old fluid. Truck for sale😐🤷😂🍻

  36. Oops. The BG transmission flush company is now out of business. I hear their process is running a chemical through your transmission (after draining the old fluid) that supposedly takes out all the dirt or impurities. But I guess it would have to take out ALL of it for the desired effect.

  37. Here's the thing Scotty, I have a great Toyota mechanic that I'm good friends with, and he does the major jobs at the dealership on the down low. Pay for a cheap job while he does that job, but also works on the major jobs. He changes my transmission fluid with that machine. If it is so hard to take down the transmission pan because it's glued on, then why try to do that way since it's sealed. Other than taking down the pan, I see no other alternative. This is for a 2015 model

  38. Engineer here. The lifetime of a transmission is 250k miles for a Japanese car and I'm guessing) 150k miles for everything else. The OEM fluid in a Japanese car is good for at least 150k and will make it to 250k unless you stress it. Just check it every 30k and when it starts turning brown do a drain and fill using OEM fluid. DO NOT DROP THE PAN! It introduces contaminates from your hands, the towels, etc. Leave the crud on the bottom of the pan.
    And never flush it.

  39. Never shift your auto transmission into P when travelling at 80 mph down the freeway or you'll end up on this channel asking, "What dat clunking noise in my Corolla, Scotty?" ^^

  40. Scotty, if the auto transmission in my 04 Rav4 ever gives me problems what are your thoughts on replacing it with a manual?

  41. Wow!! For the last few days the transmission flush has been bugging me so bad. So happy to have watched this!! Change pan, filter and fluid only!

  42. YouTube Channel -1ROAD – Doing This Will Destroy Your Transmission June 23 , 2019 This guy is flushing his transmission in his garage , not with the flush machine shops use .

  43. I did a diy fluid exchange on my 99 toyota tacoma prerunner, it had a selenoid failure. I changed the whole fluid my self and took care of the selenoid… Opposite of Scotty's advice for today. I understand my truck is old, I gambled and came out good. ALL HAIL SCOTTY THE MECHANIC LORD.

  44. Scotty, how often would you recommend dropping and cleaning the pan? My 03 corolla has clean fluid at 170k (several drain and refills throughout its life) and shifts fine. Thanks!

  45. I have a 100k warranty, I am thinking of having my transmission flushed at 80k in the hope it fails before 100k so I get a new freebie.

  46. Words to live by. My 2001 Grand Prix is all original. I change the transmission fluid and filter every 30,000 to 40,000 miles. They are notorious for going out. So far I've made it to 270,000 miles and still driving 60 mile commute 5 days a week.

  47. Hey Scotty my local Toyota dealer does Automatic Transmission fluid exchanges they claim there is no pressure flushing involved what do you think about this ??

  48. I've carefully maintained my 2006 Audi A4 since new and hope to keep it for years to come. But I believed the dealer about "lifetime" automatic transmission fluid so it's never been changed. I'm at 130,000 miles. Anything I can do to extend the life of the transmission at this point (gradual change?) or am I stuck running dirty fluid until it eventually fails?

  49. Scotty I’m looking for a work truck a 2500 diesel I’m trying to break out as a welder so I need something that is affordable 10-15k that is very reliable and I can run for many miles what is your recommendation?

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