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Thoughts on 100K Mile Sealed ATF ? #5280367 11/29/19 11:33 AM
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ChrisD46 Offline OP
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The Sonata in my signature has a "sealed" transmission supposedly good for 100K miles using Hyundai SP-IV-M ATF .
The transmission is really not "sealed" per se and there is a way to do a semi-reasonable drain & fill on it .
My thoughts : Hyundai may warrantee the transmission to get past 100K miles but I would not believe it's going to last much longer than that ... If you were to plan on keeping the vehicle would it not make sense to do a drain & fill sooner than 100K miles ? I currently have 31K miles on my Sonata and plan to keep it past 100K miles - what are your thoughts on doing a drain & fill prior to 100K miles ? If so - what mileage would you do the first drain & fill ? As for ATF the 2017 and newer Hyundai / Kia use SP-IV-M which goes for $18 to $20 per qurst (must have unicorn tears included) ! That's expensive - Maxlife ATF meets SP-IV-M and is much less expensive ($17 per gallon) .

So what are your thoughts on above statements and thought process ? Break it down and advise your thoughts ... Thanks in advance !


'17 Hyundai Sonata 2.4L GDI 5W20 QSUD / Fram Ultra #9688
'10 Hyundai Elantra 2.0L 5W30 (50%) / 5W20 (50%) QSUD / Fram Ultra #9688
'07 Kia Sedona 3.8L 5W30 Castrol EP / Fram Ultra #9999
Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280373 11/29/19 11:41 AM
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JeffKeryk Offline
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I would.
Our GS 350 F Sport has lifetime WS ATF; you don't need to change it. According to Toyota.
I am gonna service it soon and ain't gonna use WS. Take that Toyletta.

A sound point of view is an early service, like you mileage, will remove break in debris.
I say go for it and use whatever fluid makes you happy.

Last edited by JeffKeryk; 11/29/19 11:43 AM.

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Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280374 11/29/19 11:42 AM
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sp IV is a very good atf. If i were in your shoes i'd do one very soon to get some break in materials out and from there do anything from 30-60k depending on driving circumstances after that. I would stick with sp IV at least during warranty because Hyundai is known to test fluid to void them. Even post warranty i would stick with sp IV but im sure maxlife would work well too.


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Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280375 11/29/19 11:44 AM
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Propflux01 Offline
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You are right at that mileage for the first dump and fill. It’s not really hard, but just use the Kia branded SPlV-M. Same exact stuff, just cheaper. You will get most of the break in shavings out and your Tranny will be happy. While it’s prolly good fluid and while Vavoline recommends it, stick with OEM (hyundai/Kia). It’s just better in the long run, and half the price at a Kia dealer. I’ve done 4 Hyundai’s this way and have no issues. I used maxlife the first time, and while it does work, if you really know your car you’ll tell a difference. Using OEM alleviates any BS that can be given if something does go wrong. PM me if I can explain or help more.


2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"
Re: Thoughts on 100K Mile Sealed ATF ? [Re: Propflux01] #5280383 11/29/19 11:50 AM
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Originally Posted by Propflux01
You are right at that mileage for the first dump and fill. It’s not really hard, but just use the Kia branded SPlV-M. Same exact stuff, just cheaper. You will get most of the break in shavings out and your Tranny will be happy. While it’s prolly good fluid and while Vavoline recommends it, stick with OEM (hyundai/Kia). It’s just better in the long run, and half the price at a Kia dealer. I’ve done 4 Hyundai’s this way and have no issues. I used maxlife the first time, and while it does work, if you really know your car you’ll tell a difference. Using OEM alleviates any BS that can be given if something does go wrong. PM me if I can explain or help more.

This guy gets it


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Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280384 11/29/19 11:51 AM
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slug_bug Offline
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+1 change it about now, but, use only Kia branded fluid.


2017 RX350 (36k)
2016 Miata 2.0l (24k)
2013 Fusion 2.5l(99k)
2013 Focus(73K)
Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280385 11/29/19 11:51 AM
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Wolf359 Online Content
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Mercedes used to have filled for life transmission fluid, then they updated their specs and a regular change was speced at 39k. So probably somewhere in the 30-40k range is a good time to change it.

Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280394 11/29/19 12:09 PM
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I would service it. Don't tell them you did if it fails. They would try to use that as a means to not warranty it even though your servicing it was not the reason it failed.


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Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280397 11/29/19 12:11 PM
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dadto2 Offline
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I'll admit that I know nothing about Hyundais, and very little about transmission fluids... But I can say that the factory ATF in my '99 S70 (sealed transmission with no change interval in the manual) has 271,000 miles and 21 years on it and is still going strong.


'16 GMC Sierra 1500 Crew Cab 4.3
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Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280404 11/29/19 12:20 PM
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JC1 Offline
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+ 1 on the 60-90K Drain and fill approach.


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Re: Thoughts on 100K Mile Sealed ATF ? [Re: Chris142] #5280409 11/29/19 12:23 PM
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demarpaint Offline
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Originally Posted by Chris142
I would service it. Don't tell them you did if it fails. They would try to use that as a means to not warranty it even though your servicing it was not the reason it failed.


+1 Just make sure if it does fail the level was correct.


God Bless Our Troops

Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280428 11/29/19 12:41 PM
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double vanos Offline
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Ford is pulling the same thing. The fill plug is on the trans body and has a small measuring dipstick inside of it. I pulled the cap off and used my topside oiler to pull as much fluid as possible out. Measured it and then refilled - between 5-6 quarts, every 30k. When I finally pulled the pan around 110k miles everything looked great, even the filter which I disassembled to check the foam media. I really didn’t need to pull the pan and R&R the filter, the pan very little residue on the bottom.


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Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280439 11/29/19 01:01 PM
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Mainia Offline
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Change it!!! Do a 100% changeover of fluid though the radiator cooler line. First off, drop the pan and put in a new filter. The add new XXXXXXX ( I would use Amsoil or Redline personally) and put in 4 qts. Pump it out until you hear the ATF grab air and have another person turn off the car add another 4 qts until you hear the pump grab air and repeat until you get nice new red oil coming out of the line. Level as per what you find on the internet. You will have no need to change the filter again since it is a rock catcher large micron filter and you have ridden yourself of the first break-in material. Repeat in another 50,000 miles. Hyundai fluid is a good fluid, But no need to use it. I have ran Redline in my Elantra GT without any issues. If you worry about warranty even though you have the Magnuson-Moss warranty Act behind you you can feel comfortable Hyundai fluid is far superior then say Toyota WS that I just hate. That crap would be out in 6,000 miles if I had a new Toyota. My wife's Rav4 had full toasted WS at 22,000 miles because the Rav4 has no external cooler. WS can't take the heat.

Re: Thoughts on 100K Mile Sealed ATF ? [Re: dadto2] #5280440 11/29/19 01:01 PM
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JeffKeryk Offline
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Originally Posted by dadto2
I'll admit that I know nothing about Hyundais, and very little about transmission fluids... But I can say that the factory ATF in my '99 S70 (sealed transmission with no change interval in the manual) has 271,000 miles and 21 years on it and is still going strong.

I am willing to bet is you serviced your car's transmission you would feel a difference.
Smoother, firmer shifts and better around town pull.
Your car is a perfect candidate because it has not been serviced.

This has been my experience every time.


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Re: Thoughts on 100K Mile Sealed ATF ? [Re: ChrisD46] #5280441 11/29/19 01:02 PM
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Nick1994 Offline
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I had my mechanic do a drain and fill (he said around 4 quarts came out) with MaxLife ATF and then drive it around the block, then do it again. So 2 drain and refills at 100k miles.


2015 Hyundai Sonata 2.4L 106k STP Synthetic HM 10w30 & OEM
2000 Toyota Camry 2.2L 235k Mobil Super HM 10w40 & Fram Ultra
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