GoBose

Lexus gives you a 70K / 6 year Powertrain Warranty.

That's your lifetime.

I do complete fluid changes every 5 years or 35K miles.

Coolant, Transmission Flush, Differential, Transfer Case.

Flush! Yes, if you change it every 30K, there is ZERO chance of it clogging.

Aisin Wagner Transmission Fluid. https://www.aisinaftermarket.jp/en/p...atf/index.html

Motul Diff and Transfer Case. https://shopmotul.com/automotive/gear-oil/

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monju0525

The Toyota dealer did a spill&fill on my 21 RX350 @17k and I supplied the three gaskets, boutique
HPL green cc atf $60/gal. The dealer charged $90. Lexus dealer charges too much.

I also did the transfer case, rear differential oil and supplied the Mobil 1 Delvac 75w-90 with 4.6% Redline friction modifier (unnecessary and just had it around). My independent garage did it for $85.

GoBose

At 30K I do a full Transmission Flush.

Therefore, there is zero chance of any clogging but the fluid is fully renewed.

If you do a drain and fill, I would stick with Toyota OEM fluid and not mix with aftermarket.

As a complete flush its fine but not as a partial.

Yes, it's WS fluid but... I wouldn't mix it.

tempdownload

Where did you buy Aisin Wagner Transmission Fluid?

monju0525

I usually do a flush but with 17k, I went the more economical route and doing what BITOG do.


https://bobistheoilguy.com/forums/th...2#post-6919208

GoBose

In the Toyota can or in bulk with Independent dealers.

A true flush is only possible with the needed equipment.

Around $5K in cost .

If you have 40K+ on that Transmission, I would stick with drain and fill.

By 60K, forget it. The fluid is very dirty and could clog.

I go 30K and have it flushed. Never an issue.

whiteghost

2019 Lexus RX350 F-Sport

We took the vehicle in for its routine 40k mile service. Not much gets done here but I asked the dealer about doing a transmission fluid exchange since we drive mostly city, stop and go traffic.

He said Lexus doesn't recommend changing the fluid. He said they don't even have a way to do a fluid exchange. He said if it ain't broke don't fix it but that's not how I work. 👍🏻

What's your opinion on this?

Whats the power train warranty on these suckers?

Quantum501

Scroll up. There are a million opinions on this topic like oil changes and fuel grade.

The bottom line is that if you plan to keep the vehicle beyond say 100,000 miles, then a one time drain and fill at each 50 - 60,000 mile intervals is probably a good idea.
If you turn your car over b/f 100,000 miles then you will never have a problem (but the next guy might).

I questioned the lifetime fluid with my wife's 4Runner when I noticed that it had never been done by 140,000 miles (she handled the maintenance). By around 200,000 miles it started to slip and Toyota said that it was beyond the warranty.
I had an Acura that I did transmission fluid drain and fill at 50k intervals and sold the car at 305,000 and it ran perfectly.

Check out Viktor and Care Car Nut video links above.

If you are at all DIY then the job is pretty easy. Dealerships can and do the service b/c it is listed as a maintenance service item if you tow....so if your shop won't then take it to a Toyota dealership...or just tell them that you tow. BTW, use OEM fluid.

ravenuer

If you decide to change the fluid, just don't go to the dealer who doesn't know how to do it.
Fully agree with Quantum501.

GoBose

Find an independent dealer that has a transmission fluid flush machine (BG makes one and others).

Takes out over 95% of the old and replaces it with the exact same amount. No guesswork.

Ask them to use this Toyota OEM Fluid: Aisin Wagner Transmission Fluid. https://www.aisinaftermarket.jp/en/p...atf/index.htm

That's Toyota OEM fluid and it's a Aisin Transmission.

I flush mine every 30K with little to no chance of it clogging.

30-40K should be a safe range for a Flush.

Beyond that, and I would do a drain/fill with ONLY Toyota/Aisin fluid.

bamalam

I just completed a drain/fill of my 2020 RX350 (63,000 miles) using the Viktor G procedure and think I have a problem. I had the vehicle as level as possible and the final level setting was done in the 100-104 range using the OBD Fusion software and a Vgate OBDII device. I'm not convinced the fluid level is set right, though, as I think it has about 1/4 qt less in it now than it did before the procedure. Here's my math and procedure:

• Initial drain: ~3.15 qt measured in a 5qt measuring bucket. I didn't spill more than a few drops outside the bucket.
• Filled with ~3.78qt of Toyota ATF WS fluid.
• Started the vehicle and connected the Fusion software. A/T fluid temp was already at 98F (hot here today). I cycled through Reverse/Neutral/Drive/Park (loud clunk when shifting into Drive - not sure what that was.)
• I opened the drain tube plug and it drained ~ .9qt before starting to sputter a little and replaced the drain tube plug.

It appears to me that I replaced only about 2.9 qt of the 3.15qt I drained, making it ~ .25 qt low.

What do guys think? Am I ok? If it was your vehicle what you do now?

Quantum501

I think I recall that you bought the car new, so we are assuming that the level was set correctly at the factory. If it was purchased used, you have no idea if the level was correct to begin with.

I would assume that there is some variation in your measurements (using a bucket vs graduated cylinder), as well as what constitutes a "trickle". CCN video shows him closing up drain with slightly more flow than Viktor. So I think that you have some wiggle room and don't need to get the exact volume down to the oz. Also, the temp range will have some variability, so exchanging on the low end of the temp range will have a different level from the high range. I would think that if you did the exchange in the proper range and have a close volume before and after, that you are fine. I don't recall the total volume of ATF in the RX, but remember that you are only exchanging a small percentage overall.

I would be comfortable with your numbers if it were my car, but you can always repeat if it is going to drive you crazy. Good luck.

bamalam

Thanks for the quick response, @Quantum501 . You are right; I bought the RX new and this was the first transmission service. It appears from a search that the total transmission capacity is 7.2qt, so 1/4qt is only ~ 3.5% of the total volume. I'm not an automotive engineer, but a +/- 5% capacity variance would seem acceptable to this layman.

I considered redoing the procedure, as I have 4 more quarts of AT fluid on hand. However, 1) I don't know that I'd get a different result and 2) I don't know that sequential drain/fills are a good idea. Taking your thoughts into consideration, I decided to split the difference and added ~ 4oz into the fill hole and not redo the level check. I'm going to button it up and take it for a test drive now. Hopefully my biggest problem is OCD. Thanks again for your thoughts.

GS4_Fiend

iTrader: (22)

As long as the vehicle is leveled, drain the excess to a trickle before it reaches to 113F you should be fine. And dont worry more because that is the official procedure.

Rx350driver

The lifetime fluid is BS, nothing is lifetime. I just did a drain and fill at 100k miles, will do another in 10k miles. This way, my tranny doesn't blow up at 150k miles. What does Toyota define as "lifetime", the powertrain warranty period?