snydertalo

This DIY was linked from a 2nd gen posting (https://www.clublexus.com/forums/rx-...uid-flush.html) but it basically states to use Desron II or III. The problem is I'm having an issue finding in something official where it states to use ATF vs power steering fluid.

The maintenance schedule just states to check all fluid levels and replace brake and transmission fluid...nothing specific about power steering (http://www.lexus.com/pdf/service/MY1...350_WSG_lr.pdf)

This guy is emphatically upset that PS fluid was put in his 2nd gen and not ATF (https://www.clublexus.com/forums/rx-...ing-fluid.html)

Do I really need ATF?

RamAirRckt

Correct, Dexron III. Don't use T4, WS, Dexron VI or Power Steering Fluid.

Lexus recommends only Dexron II or III. I think the PS cap says it too.

PS fluid is a friction modified fluid that the American cars typically use. Oddly the Lexus/Toy uses Dex II/III.

Just use the right stuff. Not PS fluid. Just use Dex II/III. I use Dex III in everything I have (GM and Lex) for PS fluid. Never an issue.

snydertalo

Is there a good synthetic I can get? I picked up Valvoline DIII from O'Riely's, but prefer to spend more for quality fluids.

RamAirRckt

I use Amsoil ATF only in mine. Nothing less. I tried Royal Purple PS fluid, but the steering didn't feel right in my GS400, I flushed that junk out till I got only red Amsoil in there. That is when I realized that it requires Dex III not PS fluid.

Any Dexron III is going to be a good fluid. Get a good name, synthetic isn't required at all. Nice to have, but not required.

Toyota/Lexus never required synthetic.

lexsc4

I flushed and refilled my with Dexron ATF last Nov and no problem since.

http://www.valvoline.com/products/co...ssion-fluid/33

thomas1

I used Mobil 1 automatic tranny fluid successfully in my Old RX300. No problems whatsoever and it was synthetic

mandyfig

Dexron III, that's what you need!

glenpointe

You used Valvoline Maxlife replacing PS fluid in your RX300r?

NOVARX300

I've had a leaky bellows boot but haven't had to add Power Steering Fluid (PSF). I'm now at the lower "cool" line level so I need to add it. First time since last April. I also want some on hand in case a major issue occurs. I'm planning on replacing the leaky passenger-side boot and then the whole rack when necessary.

The question is since I've had different mechanics servicing my 2009 RX350 for several years I don't know if they've used a generic PSF or Dextron III. I'm planning on purchasing Dextron III. Can I just add the Dextron III to the reservoir or should I take the additional step to flush out the remaining unknown PSF before adding some Dextron III? I will obviously request Dextron III when the rack is replaced.

LeX2K

If you suspect there is power steering fluid in the system get as much out as possible.

Felix

I'd flush the p/s system out, if its old fluid......Same as the brake fuild w/ new dot 3.....