is it an automatic trans? usually u need to change ur transmission fluid for u auto trans about 30k miles, drain the old fluid, fill it up with new one then drive for couple days then drain and fill again, do that for 3 times, u now should have clean trans fluid. repeat those step every 30k miles.
doesn't matter wat car u have, as long as u have an automatic transmission, u need to change the fluid around 30k miles. manual transmission might take longer to b needed to change fluid but still need to be changed.
2009 Venza here also (V6, AWD) (among others in the stable; Honda, Acura, Dodge, Toyota). The automatics get a fluid drain and refill (at a minimum) each 30K miles. Sometimes they get changed more often, depending on what kind of mood I'm in each September, when all the fluids/filters in everything get changed. Amsoil in everything. Never done, and never will do, a "flush". The Venza has around 103,000 trouble-free miles.
Most here will probably agree that no fluid is a "lifetime" fluid. Additionally, most folks' driving habits and/or vehicle use fall under "severe service" category. As such, even manufacturers suggest that fluid be changed, even though "lifetime", or changed more often if not "lifetime". Automatics are, by their design, wearing themselves out from day one. Anything you can do to slow the process is probably good. Fluid changes, auxiliary transmission cooler, whatever it takes.
I watched about 1/2 of the transaxle video then my face hit the desk and woke me up. How about measuring what you drain out then replace that amount? - if there are no leaks
Sure, that could work if you're comfortable assuming there are no leaks and that the previous level was correct. Or just do the leveling procedure for more peace of mind.
To each their own... I found that transaxle video and others, eg about the AWD system, by the same professor to be very interesting and educational. I may even have watched that video more than twice..
The extra complication and equipment is just for doing the ATF leveling when the vehicle is hot. That is relevant to shops that want to get the job done quickly and don't have time to let it cool to the level check temperature in the service manual. Not too relevant for DIYers but can still be nice to know. The videos I linked are more practical for DIY.
I bought my used 2011 Venza last year with 97k and a friend of mine told me that if I didn't want to pull the pan and replace the filter that he recommended that I drain and fill around 2.5q when I do my oil change. The Venza is high enough off the ground so I didn't even need to jack it up and enough clearance in the driver wheel where I just had to turn the wheel to get to the 24mm nut behind the plastic piece. The first time I did the day after I bought the car the fluid was grayish black (also when I took off the plug there was no fluid coming out with the plastic piece still inside), the second time 6 months later it was a dark purplish brown and this previous weekend I decided to do it twice (Sat and Sun) and the color is now reddish purple. The car seems to shift into gears at lower RPM and and it doesn't vibrate as much when you shift into reverse.
Change mine often enough not to have all the transmission problems that most complain about here on the forums. Maintain perfect shift quality too!
At 100k, I change the filter always. By 100k, I've had 3-4 drain/refills and/or gallon pump-outs from the cooler line.
And, I always check the level using an OBD2 scanner.
ATF evaporates, just like motor oil. It's akin to NOACK volatility. So, the whole "just measure and put back the same amount is a joke". You must overfill and check per the FSM 'colder ATF check temp'. The hotter ATF check temp is for shops that don't have the time to let the ATF cool down.
I just called my dealer "the drain and fill is too labor intensive" it would be 11 hours and $2000 they recommend a transmission flush @ $376.
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