Used TOYOTA WS Automatic Tranny Fluid analysis :

[Hershey]

here's an analysis of the factory fill of Toyota WS tranny fluid for an '06 TUNDRA with 59,000 miles that came back a bit weak , http://www.bobistheoilguy.com/forums...90#Post1694190 . Know it's a truck that's been used to tow , is heavier than YARIS , etc.. , but figure the YARIS could use a flush and fill before the 100,00 miles stated in the owners manual . Especially if live in mountainous terrain , stop and go driving , etc.. There's also residue from sealants , etc. ( contaminants ) . So, what's your opinion of changing A.T.F. in a YARIS earlier ? Looks like AMSOIL A.T.L. ( www.amsoil.com/storefront/atl.aspx ) can be used in place of the WS . It's less than $10 a quart . Anyone using this or daring enough to ?