Originally Posted by spuds

This bit should clarify the question for you.

My experience on a pump replacement and flushed completely NOT using Dexron III but synthetic which doesnt work,It buzzes/whines.Done on a new OEM pump from Lexus.

EDIT-Actually Im NOT happy with the synthetic Valvoline fluid.There is still a very slight buzzing and even my stinky brown Dexron II or III mineral ATF did a better job.I couldnt find Dexron III locally so find out the plain Toyota ATF is dexron III.So go to Toyota,he doesnt have it,we use STP,and they dont make Dexron III any more.So show him Toyota part number,he looks it up,Oh,they do make it but we dont carry it.So get him to check other places,one has like 66 qts of the stuff.Wound up just ordering 4 qts off ebay and cheaper delivered than Toyota.Will get that changed,it wants dexron III and thats what it will get.
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Yup,mine had a nasty buzz with the synthetic that didnt get better but actually got louder,thats not good.This was a pump change and complete fluid change with synthetic.Car calls for Dexron III.Ive no doubt you can top off with synthetic and its compatible as in it wont hurt it and probably be just fine,as in a small amt no problemo.

BUT,complete flush it will buzz like bees.I flushed with Toyota ATF and it quieted right up after a bit of driving and now functions nice and quiet like it should.

So I flushed with this stuff,TOYOTA AUTOMATIC TRANSMISSION FLUID. In the black qt container.Says right on it "Formulated to replace Dexron III in applicable Toyota models.Make sure you get the right fluid that says right on it its the dexron III replacement,with net research shows it is Dexron III and further people use it in the Dexron III Toyotas that call for it in power steering with perfect results.
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https://www.clublexus.com/forums/ls-...ing-noise.html

Toyota Genuine Automatic Transmission Fluid.
The premium ATF specifically designed for Toyota automatic transmissions


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Originally Posted by RA40

I've run Mobil 1 ATF in ours for the last 150K. CA's had a few EPA issues with the formulation over the years so for a couple years it was NA. Both the shops I would have repairs done at also recommend Mobil 1.

Originally Posted by ls400newbs

I had read about the mobil 1 ATF in other threads. I originally planned to used it but couldn't find the name for it. Didn't want to risk using the wrong thing and went with what I found in another thread (valvoline... Turns out that one can also give problems so I didn't do myself any favors there...).

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