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to check transmission fluid in a 2011 lexus rx 350 fwd there is no dipstick, but the transmission is not sealed as the dealer will tell you, thats a gimic for you to bring youre car to a dealership!
simply remove the drain plug from the transmission on the main bottom, the fluid will not come out, there's another fluid retaining plug above that!
next the fluid add hole is on the side of the transmission behind the driver side wheel towards top of transmission!
you simply add fluid whether you pump it in or snake a rubber hose off of a funnel, when the fluid is full it will come by the bypass plug and leak out the drain hole, at this point that's the correct amount of fluid!
simply re install the drain plug and the fluid add plug and you're done!
cost me $100 at a transmission shop to find this out yesterday
there is no cap, to add transmission fluid you must pour it through the dipstick pipe. Transmission fluid should not decrease in leavel unless you have a leak. I would have it checked if you are losing trans fluid!!
I know from experience that you should only use manufacturer recommended fluids in your transmission, Especially toyota, they are very peculiar about the fluids you use in them. Although the fluid you put in it may not cause any harm, it is always best to use the fluids recommended.
If you haven't already, try draining the transmission fluid and replacing it with new. It's recommended to complete this service every 60,000 miles. Also try adding Rislone transmission additive. It worked wonders on my Ford Escape! If you have the fluid changed by someone else, it's advisable to NOT flush the system. The pressure caused by vacuuming it out could create more harm than good.
Transmission problems in the RX300 are common for those who never flush the transmission fluid. I would strongly urge you to quit driving your RX300 and get it to a dealership where they can flush the transmission fluid. There is no transmission fluid filter (per say) but there is a "screen" inside the transmission that needs to be flushed out (this serves as the filter). Pull out your dipstick for the transmission and smell the transmission fluid - does it smell burned? I hope not, but regardless, take it to a dealership and get the tranny flushed and see if that makes a difference. Also, continue to flush the transmission every 60,000 miles at most! Lexus says that you do not need to flush the transmission, but I think you do. I have a 2001 Lexus RX300 and I have had no problems with the tranny and I've flushed it at 60,000 miles and then again at 115,000 miles. I now have just a little over 120,000 on it. It's a good running vehicle but you need to care for it!