Personal opinion on WS fluid replacement interval

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No, that won't work. It has to be fed through the fill case. That is why it helps to have a spotter so you only drain a couple quarts at a time. Then fill two quarts and repeat until you have bright red fluid. As I recall, it only takes about 10 seconds to drain a couple quarts. Using a long hose to the fill case makes it a simple process. I add a small amount extra from what I drain, get to temp and pull the overflow. Pretty easy.

Yeah you are correct. I was thinking of how this works:

BG PF5 Power Flush and Fluid Exchange System | BG Products, Inc.

The BG Flush machine taps your line and it pumps new fluid into the return line. In theory the above video leaves a small amount of original fluid in the system (whatever was in the return line that never gets circulated).
 
Its my understanding that the power-flush systems are the ones that Toyota really recommends not using. They force fluid through the system - which seems to be responsible for causing problems later on - not sure if its due to introducing contaminants or if its from dislodging some gunk that was perfectly happy living where it was living.... Kinda like dislodging some gunk in your veins that goes up and causes an aneurism....whereas the gunk in your vein could have stayed put and allowed you to live an otherwise decent life! OK - maybe that got too serious too quick...
 
I replaced mine with Amsoil WS compatible fluid at 55k. Peace of mind, and better performing lubricant. I can’t find a disadvantage...
 
As long as the exchange machine doesn’t force fluid back into the cooler return any faster than the transmission pumps it to the cooler in the first place it won’t do any damage. I’m not sure how smart they are but I’d bet they know the risks and design them to mitigate.

An actual flush with treatment chemicals are where things go bad. To me “flush” implies it is using flow to dislodge/clean things.

Also an aneurism would be when you pop a transmission cooler line. Certain types of stroke or heart attack are caused by stuff getting knocked loose. But yes all of these are very bad things.
 
Yeah you are correct. I was thinking of how this works:

BG PF5 Power Flush and Fluid Exchange System | BG Products, Inc.

The BG Flush machine taps your line and it pumps new fluid into the return line. In theory the above video leaves a small amount of original fluid in the system (whatever was in the return line that never gets circulated).

My FIL has a similar exchange machine. Works well on his Toyotas. He has an 2011 200 and a 78 FJ45. Keep telling him to get on mud. If I lived closer I'd be all over using his exchange machine. But the method in this thread is really eas
As long as the exchange machine doesn’t force fluid back into the cooler return any faster than the transmission pumps it to the cooler in the first place it won’t do any damage. I’m not sure how smart they are but I’d bet they know the risks and design them to mitigate.

An actual flush with treatment chemicals are where things go bad. To me “flush” implies it is using flow to dislodge/clean things.

Also an aneurism would be when you pop a transmission cooler line. Certain types of stroke or heart attack are caused by stuff getting knocked loose. But yes all of these are very bad things.

Yep, even the relatively cheap exchange systems you can buy on Amazon have a PSI regulator. My FIL has one. Pretty cool, but I live too far away to make use of it. His is similar to this:
https://www.amazon.com/BestEquip-Au...8-1-spons&keywords=oil+exchange+machine&psc=1

The method shown in the video in this thread works well enough for me. Don't need another item filling up my already full garage.

I think my biggest issue with an exchange machine is the potential for mixing incompatible fluids. I could see that causing damage.
 
That video is great, but the 8 speed is different in some ways. Does anyone know if you need to lock out the recirc valve on the 8 speed? Thanks to @SWUtah for allowing a mini-hijack.
 
Will most dealers do a full exchange? Normal cost$

I scheduled today the full exchange for my 2013 LC at the local Lexus dealer. The 4 Toyota dealers near me and with in an hour, would only do the 4 quart drain, which I did at 100,000 miles. Lexus dealer said no problem with the full exchange this Friday. Cost is $310.
 

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