Hello . i have 2007 RX350 , and i cant find anywhere the factory correct instructions how to check transmission fluid level with the dipstick. I beleive that the corect leve should be setup with the exact temperature of the fluid. "Like the models without dipstick". Because every 5 degrees celsius fluid expands a lot. On the dipstick there is cold and hot. On models without dipstick it says that cold should be temp under 30 degrees. Hot 85 degrees wich i very hot and a lot of driving in hot climate should be done for this. But this is for models without dipstick. For dip stick they said drive around 10-20 minutes wich for me is not accurate at all.
Did you guys have any factory instructions for this. I want to know what temperature is for dipstick mark cold , and what for hot.
Thank you !

 

The process for checking the atf level in this transmission is old school from the 1940's, which you don't seem to have any faith in.

This is cut & paste from the service manual for my 2007.
It is the same for both versions of the transmission:

AUTOMATIC TRANSAXLE FLUID
ON-VEHICLE INSPECTION
CHECK FLUID LEVEL

HINT:
Drive the vehicle so that the engine and transaxle are at normal operating temperature.
Fluid temperature: 70 to 80°C (158 to 176°F)

a. Park the vehicle on a level surface and set the parking brake.
b. With the engine idling and the brake pedal depressed, move the shift lever to all positions from P to L (S1) and return to the P position.
c. Take out the dipstick and wipe it clean.
d. Put the dipstick back all the way.
e. Take out the dipstick again and check that the fluid level is within the HOT range.
If the fluid level is below the HOT range, add new fluid and recheck the fluid level.
If the fluid level exceeds the HOT range, drain the fluid once, add the proper amount of new fluid
and recheck the fluid level.

If there are leaks, it is necessary to repair or replace O-rings, FIPGs, oil seals, plugs and/or other
parts.

 

Thank you ! When i drive my for 10-20 minutes it is ussually 56-60 celsius. I will atach diag tool and chek it on 80 celsius.