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Oh well, I did it today. Wanted to get oily.
Was at 2 years and 25 000km, I guess that once every 2 years is reasonable.

Used valvoline synthetic (red jug). One is enough for a drain and fill.

Drained 3.9 litres or so. Refilled 4.3 litres or so before it began overflowing (warm). Then drove around until hot, then re-opened the checkplug and it drained a slow stream like they say, so I just closed it and that's it.

I guess next time I'm going to measure out what I drain and just refill that.

What I drain wasn't that bad, a bit on the dark side with some chunks, there was quite a bit of metal on the drain plug.
Other than that, not much, it's an easy drain and fill.... most of the time involved is getting the stuff out, removing the underpan, and cleaning up, so next time I'll do it when I do an oil change.

Overkill to do a drain and fill every year?
 

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I had 25 000km and the fluid looked a bit bad with chunks and metal.... I wouldn't want to see yours at 112 000km?
When I did my maxima the first time with 55 000km it was pretty bad.

Will probably just do a drain and fill once a year from now on, doesn't take much longer when doing an oil change... most time is needed to just prep and clean, and remove the underbelly pan.
 

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Well then I won't show it to you when I drain it - assuming my tranny makes it that long. Another situ where it's up to the individual to decide what maintenance needs to be done at what interval, never hurts to change fluids out, I did do the the rear diff at 60 k miles and it was quite clean. Tranny fluid should become a darker red over time , but finding "chunks" in it seems unusual.
Well, you are already at 112 000km....

And I can assure you that your tranny fluid isn't a darker red, it's black with chunks and there is a crapload of metal on the magnet....

Because mine was brown with chunks and metal at a quarter the distance.... seriously, it wasn't anywhere close to red or dark red anymore.
 

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sounds like a bleak and foreboding outlook for my tranny, but seeing this is a 2013 SFS with the illustrious 2.0T Theta II engine - I'm far more concerned about the long term viability of the engine than the Hyundai tranny - which by most accounts would seem to be a solid design.
A 5 litres of valvoline atf is 30$ CAD, probably 20$ USD.... for an added 20 minutes when you do an oil change, it's an easy flush and drain, whatever.

Simplest way would be to just measure the drained fluid and refill the same. I'll do this next time, save the doublecheck thingy
 

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I'll take the 30$ a year gamble of replacing 4 litres of atf myself, but that's just me...
my 2004 maxima, notorious for failing transmissions, started having hard shifts at 50 000km.
Started changing the atf every year(fixed it immediately). Sold it with 200 000km and a perfectly smooth transmission 6 years later.

The santa fe just started giving me rougher shifts after 2 years, and since I have changed the atf, it's been back to normal as far as I can tell, I didn't get rough shifts this week so far.
It's not really longer when you are already draining the engine oil to just pop another plug, let 4l out, measure, pour the same in, and done. Longest part is really just prepping, ramps, remove underbelly, and then the cleanup... oh well. whatever. trust me the fluid wasnt any shade of red....
 

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my tranny has been shifting hard a few times in the last week.

35 000km 2.5 years
I have drain/filled fluid last summer once.

Will do it again this spring and see how it evolves...
 
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