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jonharis said:What if the thing goes 100 miles from the closest cell service? Then is it worth it?
Added an interesting ATF article in the OP.
Still wondering how long MR T intends for the original WS to last... 100k, 200k, 300k etc...
Not that far. It says right in the manual to inspect it at 60k for severe duty and 100k for regular duty.
They already covered their asses.
It's not anymore sealed than any other trans, it just doesn't have a dipstick, so opening it up and inspecting the filter/flushing the fluid isn't much different than one with a dipstick, you just fill and check the fluid differently.
Regular service intervals are important, as no fluid is "Lifetime", it may last a while, but fresh fluid keeps things cleaner and working better over the whole lifetime of the vehicle.
Here is a TSB and it looks like the system is sealed after all. Also, I can see why a dealer doesn't want to touch the fluid change service. The WS can not be exposed to humidity w/o some side effects to the tranny shifting.
BTW- I only have a 99 LC with T-IV, but I am researching this for my LS in case anyone is wondering why...
WS is a lifetime fluid. It never needs to be changed for the life of the transmission. You can ruin the fluid if you over heat the transmission fluid but if you do this then you "know" you did it by towing somthing over the vehicle limit up a mountain in high heat conditions. If you did that then you should change the fluid ASAP and hope you did not ruin the transmission. If you drive your mall queen like most owners then you will "NEVER" need to change it. An industry expert once told me that changing transmission fluid for normally used vehicles is a waste of money that was 20 years ago. With todays advanced fluids it is a real waste of money. If you do decide to change the fluid, odds are you might damage your transmission by getting contaminates in the transmission during the change, more then if you just drove it. The guy changing your fluid might not be as careful as you wish he might be. My Lexus dealership has "never" changed the fluid on any LX under normal driving conditions. The only time they have changed the fluid is when the owner requested the service. They have replaced transmissions for owners who had their fluid changed by other vendors.
I did drain & fill. It was not dark but color was way darker. 5k since change and no problem . YMMV.
And just to clarify another myth. Toyota states that the color of WS does not indicate its condition.
Myth it may be but my real life driving says its better. YMMV
I don't believe you, at all.
There is no such thing as a LIFETIME lubricant. I work in heavy industry - almost 100% of gear train failures is fluid related.