tommewin

So after doing a bunch of searching regarding tranny fluid changes on the RX350 (not the 330), I've discovered that I screwed up and did one drain and fill with Toyota T-IV fluid (4 quarts).

I've read in some threads that the WS ATF is supposed to last the life of the car (which is hard for me to believe) so I was planning on doing a drain and fill every 10k miles or so.

I also read that WS ATF does not play nice with other fluids so my question is, should I pay for a complete WS ATF flush? Or do more frequent drain and fills to slowing bring my total WS AFT ratio back to 100%?

If the transmission holds about 14 qt or so of fluid, 70% of it, in theory is still WS ATF. That number will increase with constant drain and fills.

Any thoughts?

tommewin

I have an '07 RX350 btw. I wasn't sure if the 2010 shares the same motor.

hesham1

yea get that WS ATF back in there ASAP... how many miles on your RX

tommewin

56k. Luckily I haven't done much driving so I guess I should be glad about that. Going to pick up a bunch of WS today and have my shop do a complete flush.