1st transmission fluid change at 100k. - ClubLexus - Lexus Forum Discussion

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1st transmission fluid change at 100k.

 
Old 03-11-19, 11:15 PM
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crisp76
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Default 1st transmission fluid change at 100k.

I just bought my GX about 2 months ago. There are no signs that the fluid was ever changed. What are your recommendations on which fluid to use? There are no issues with the transmission. Not sure if I should use the WS Toyota or something synthetic like Amsoil.
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Old 03-12-19, 04:51 AM
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Personally, I wouldn't deviate too far from the recommendations from Lexus. Amsoil is excellent, I just wonder if it is specific enough for these engines? Lots of folks here use Amsoil in the tranny, as the engine oil and for the differential, and are pleased...I haven't and likely won't for the tranny as I'm still under warranty.
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Old 03-12-19, 10:50 AM
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This topic has been debated before and to be honest I donít know which one I agree with. Half of our members say it never gets touched unless you tow and others donít feel comfortable leaving transmission fluid in for the life of the truck. I have 74k miles now so I havenít done anything and would love somebody like Acrad35751 or Mann777 to convince me one way or the other. Oh, and good luck with your GX.
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Old 03-12-19, 12:47 PM
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I'm curious on this as well. I've put Mobil 1 in a couple of high mileage Toyotas over the years but haven't ever had a Lexus until this one.

As a general rule, I change transmission fluid every 30k, just doing a drain and fill (doesn't get anywhere near all the fluid out on an automatic). Every 90K I'll do a drain and fill, drive for a couple of days, another drain and fill, drive a couple of days, then another drain and fill. That gets the fluid diluted where at least most of it should be fresh in there.

Keep in mind most of my vehicles have antique tags on them and I still look at automatic transmissions knowing there's some kind of evil voodoo magic that makes them work.

Tagging to see what information pops up in this thread.
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Old 03-12-19, 01:05 PM
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I trust Toyota/Lexus engineers.
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Old 03-12-19, 01:25 PM
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I normally use Amsoil in most things but for the transfer case I used the golden fluid and plan to use Toyota WS for my AT. I already have a case of it for the job a couple weekends out. Just gonna do a 3-4 quart drain and refill. I don't like to mix fluids and if I was doing one of those drain and refills out of the AT cooler line in front then I would possibly consider an alternate AT formula.

https://www.clublexus.com/forums/gx-...l#post10338243

[From the owner's manual]

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Old 03-12-19, 09:37 PM
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Originally Posted by Acrad35751 View Post
I normally use Amsoil in most things but for the transfer case I used the golden fluid and plan to use Toyota WS for my AT. I already have a case of it for the job a couple weekends out. Just gonna do a 3-4 quart drain and refill. I don't like to mix fluids and if I was doing one of those drain and refills out of the AT cooler line in front then I would possibly consider an alternate AT formula.

https://www.clublexus.com/forums/gx-...l#post10338243

[From the owner's manual]
i wanted you to convince me to do nothing, I have 74k miles so I at least will wait until 100k thinking the Toyota/Lexus engineers at least mean 100k if not lifetime.
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Old 03-13-19, 03:53 AM
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I'm in the same boat. It feels like it should be changed, but I am going to trust them.
My dealer just told me the same thing (74k) when it went in for the airbag.....
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Old 03-13-19, 07:47 AM
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Except on my Honda where I changed the AT fluid at 60k, my others are usually around 100k.
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Old 03-13-19, 08:26 AM
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I'm probably going to run my fluid until I get rid of the vehicle.

#1 there's the cost issue, #2 it's a toyota, it could probably run on olive oil, and #3 cracking open the transmission is just one more opportunity for something to get messed up.
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Old 03-13-19, 02:01 PM
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If you have a '14+ model you can always check the ATF Thermal Degradation number. This isn't available on 10-13 models. It can also be viewed on OBD Fusion phone app. I saw someone on Tundra forum who regularly towed a large trailer and they were hitting over 65K on this thermal estimate after 20-30K miles. More than likely fine at 100K miles if you aren't towing.

https://www.clublexus.com/forums/gx-...l#post10179498
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Old 03-13-19, 02:11 PM
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Originally Posted by Craigyyy View Post
I'm probably going to run my fluid until I get rid of the vehicle.

#1 there's the cost issue, #2 it's a toyota, it could probably run on olive oil, and #3 cracking open the transmission is just one more opportunity for something to get messed up.
#3 is why i will just leave it alone.
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Old 03-13-19, 02:30 PM
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so am I reading correctly that this "OBD Fusion" app on my iphone will allow me hook up and run diagnostics on the GX without having to actually have an OBD tool?

Edit. Looks like I have to order a diagnostic tool to work with the app. Anyone have one that will work on older vehicles AND work with the iphone? I am tech illiterate. I prefer gears to circuits.

Last edited by jeepwm69; 03-13-19 at 02:34 PM.
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Old 03-13-19, 02:34 PM
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Correct. You will want to purchase the model year specific add-on to OBD Fusion. This gets you access to all the modules in vehicle. Anything outside of engine or emissions won't trigger a CEL so this can help you troubleshoot. Aside from OBD Fusion you just need to pick a Bluetooth or Wifi OBD dongle to connect to. This makes for a nice portable Techstream. You can even check your tire pressure with it ...as it will display the PSI and Tire temps.

https://www.clublexus.com/forums/gx-...s-via-obd.html
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Old 03-14-19, 05:24 AM
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Originally Posted by Craigyyy View Post
I'm probably going to run my fluid until I get rid of the vehicle.

#1 there's the cost issue, #2 it's a toyota, it could probably run on olive oil, and #3 cracking open the transmission is just one more opportunity for something to get messed up.
True also depends how old your car is. What happens is, as the clutches, bands, etc. all wear they deposit a lot of material into the fluid. The longer you leave the fluid in, the more the trans wears internally and what you end up with is fluid that has, in suspension, a lot of metal particulate. This actually ends up acting as a friction device, within the fluid, and the trans keeps running fine (or at least "ok") like this. However if you then drain/flush the fluid after "waiting too long" you end up removing all that is suspended in the fluid. Then you put in new fluid that doesn't have any of the suspended particles and thus has little to no friction properties. Then things start to slip, then it can't be fixed until you overhaul/rebuild the whole gearbox.

Changing the fluid on a 2013 (you didn't say how many miles or when you changed it) is fine and appropriate. It's when you wait like 10+ years and have hundreds of thousands of kms on there and then think it's a good idea to change it--that's when you've "waited too long".
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