Drain and refill 235K transmission fluid?

I disagree that you just want to slam it in there. I’ve seen on very old and under serviced transmissionmissions where issues do arise. For whatever reason.

I do feel that the slow methodical process did swapping in new fluid is a good idea if viable. It usually is viable with a dipstick extractor or a drain plug.

It also helps because while some vehicles like Mercedes have easily accessed torque converter drain plugs, most don’t. A pan drop and filter change could leave many quarts/half(?) the fluid in there. Doing a few extract and fills helps dilute the old fluid so the remnants are newer too.

There’s no doom and gloom. Change it! But a small initial/few changeout to get some new detergents and dispersants in there is best practice imo.
Absolutely. Take a measured, gradual approach to the drain and fill to get a better overall replacement and minimize sediment or wear materials. I was talking about the old horse that after a transmission has had oil for too long, it is past the point of safely changing it. Of course, there is never a meaningful explanation!
 
2006 Toyota Matrix 235K miles. I have owned this for the past five years, purchased with 220K miles on odo. Transmission fluid looks dirty, smells fine. Should I drain and refill or just leave it alone. Manual says changing fluid is “unnecessary” under normal driving conditions. Is it better to let well enough alone, or should I give the old girl a shot of new fluid?
I would do a drain and fill ONLY
 
Most of them do, in fact, have a drain plug. Including the OP's 2005 Matrix. It's the "American" nameplates that are too cheap to include a drain plug. The Euros are hit or miss.

Every Japanese car I've worked on had a transmission drain plug. Multiple Hondas, Toyotas, Subarus, and a couple Nissans.

American cars with no drain plug: the final gen Grand Am, 3rd and 4th gen Firebird/F-Body, Mk1 Focus. The only American car I have experience with that had a transmission drain plug was the Saturn S-Series.

When Ford owned Mazda, they often used the same engines and transmissions across both brands, yet Mazda included a drain plug but Ford didn't. Example: Ford Fusion (no drain plug), Mazda 6 (has a drain plug). The Focus used the 4F27E with no drain plug, but Mazda included one. Since they use the same transmission with the same pan, you can get a pan from the Mazda dealer and install it on a Ford with that transmission (or use an aftermarket pan).

In most Hondas, changing the ATF is *easier* than changing the oil :D
My only one has a drain plug - only Lexus blocked the fill port with the exhaust - other side is wide open with no port … 😡
 
Dealer is my plan … too close to ground for me to do …
(my Jeep is fairly easy)…
Yup. I bit the bullet and had a great Toy/Lex local shop service our '13 GS350 transmission. At 73 I'm a lot more scared of a piggy car falling on me than I use to be. Plus you gotta mess with that exhaust stuff... Shop pumped about 11 qts through as I recall.
 
Bought a hyundai sonata a 2010 i
With 125 miles. Pulled dipstick and fluid level was good it was a bit dark but no burnt smell. Had to drain and fill 3 times to get it all out. 2010 was the year before the engine screwup that sidelines thousands of car needing engines costing hyundai millions if not billions of dollars.

Change it. Good luck
 
Get ramps. Best thing since sliced bread
Except many require a level vehicle to set the fluid level. I have driven our Mercedes up on ramps then jacked the rear up on stands. You don't need to do it more than every 40 - 60k miles. With Mercedes and some older American cars you can drain the TC through a plug. So I go ahead and replace it all rather than having to do the raise the car thing three times.
Anything with a dipstick you can do with an extractor unless you need to change the filter.
 
Tru.. most of my vehicles use dipsticks.. not sure the engineer that said,, "let get rid of the dipstick and save .05 per car to make the owners life HELL".. but he/she/they need to be hogtied and beat with rubber hose for a bit.. dumbest idea ever.. if u ax me.

Except many require a level vehicle to set the fluid level. I have driven our Mercedes up on ramps then jacked the rear up on stands. You don't need to do it more than every 40 - 60k miles. With Mercedes and some older American cars you can drain the TC through a plug. So I go ahead and replace it all rather than having to do the raise the car thing three times.
Anything with a dipstick you can do with an extractor unless you need to change the filter.
 
I changed it on my daughter’s +220K mile Hyundai with questionable history and it significantly improved performance. One drain and fill was plenty.

I have also had issues after changing it on a few high mileage vehicles. Most will likely say it was on its way out anyways and the fluid did nothing. And that’s probably true. But all I know is transmission was working, I changed fluid, and it stopped working. There is a risk.

That said I’d do it. And clearly I did.
 
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