You're welcome!

Actually a firmer shift is better for longevity. The smoother the shift, the more clutch like material being worn away.

Mind you when I say firm, I mean you can feel the shift occasionally. With the T-IV you have to really try and feel for it. I wish I could explain it better. Many people won't see a difference in the way it shifts, I however have a sensitive butt dyno. If I could get the Castrol IMV for the same price as T-IV, I'd go with the Castrol every time.

Yes, Mobil 3309 is the same as T-IV.

 

Really? Smooth shifting is bad.. Who would have thought. I guess I'll go it's the castrol.

 

These cars require T-IV, so in my opinion there really isn't any reason to chance putting anything else in. I decided a long time ago to keep the fluid in my cars bright red with T-IV. Have had excellent results - not saying there isn't a different way, but I chose to stay with T-IV and accordingly I sleep well at night.

 

I have been using Mobile 1 synthetic trans fluid since 1988 ran a 1986 Toyota Cressida past 529,000 and my 1991 LS 400 past 300,000 going for 400,000 using MB1 and never had any trans problems change it every 30-40k pumping 4 quarts at a time thru my trans cooler and change out 12 quarts when I do it. Now I am using Max Life trans fluid from Wal Mart half the cost of MB 1 and just as good in the trans PS motor etc.

 

What ATF you ultimately use should be a reflection of how you drive your RX300 and what you do with it. I haven't raced it in over 6 years, and now it gets more highway miles (and unlike Mexico I have access to many more quality fluids). More important, monitoring the mileage and quality of your fluid.

 

What ATF are you using now?

 

I changed my tranny fluid and flushed the power steering fluid with Mobil 1 ATF and the tranny works great. Its been in there for 40K miles so far. My power steering unit would squeal every now and then upon start up and since the flush it has quieted down, sounds normal now. There is a sticky I believe on how to flush the power steering fluid. I followed that procedure and 20K miles later it is still quiet upon start up. This worked very well for me on my 2001. I have 135K on her now and she runs like a top....so far.

 

i found the castrol multy import vehicle fluid (or what ever they call it) to give excellent shifts when i had my 2001.

 

look at you moving on up like george jefferson with your 2015 RX............. .......... I use that fluid as well..

 

thanks man... the first generation rx`s rule.....