No the " dilution factor" DF= Vf over Vi of replacing the transmission fluid is the fashion you mention is error. When you do it your way you contaminate the new fluid with the old. And you can not do anywhere near the best job DIY method anyway!
Dude when are you going to except you made a mistake (I can at least understand that ) in your response and learn from at least 2 of us that do this for a living, have done it for a few years and are experienced with doing it without harming a transmission?
grim_reaper is a MAZDA Technician and I am ASE Master Technician L1 & L2 for over 3 decades and current !

 

I'm very close to locking this post.

SHIPO, Pull your head in mate.

 

I agree with you.
A few of us are just repeating the same thing and a few of us are not listening to empirical information.

 

What is the precise way to check the gearbox oil size with the car oil gauge ?What should the gearbox at oil level be when the car is cold? When the car was not running for 24 hours, the engine was completely cold.I checked the gearbox oil level and it was 5mm at the end of the oil gauge.Was the oil level correct?

 

When the car behind the red beam should the gear shift from idle d to idle n, how long will the car stay in idle D and the foot on the brake?Is moving too much gear from D to N the gear while in traffic is damaging to the gearbox?

 

Checking the transmission fluid is best carried out with the engine nice & hot, at least a 20 minute drive.
Checking the transmission oil requires the engine to be running.
Shift from park to drive, to neutral, to reverse, back to neutral, into drive, into park.
Keep the engine running.
Open the bonnet / hood, pull out the dipstick / oil guage. Wipe it clean & re insert fully, pull it out again, hold it horizontal.
Depending on models, there maybe a min & max for both hot & cold fluid, or just a min * max mark.

Also, sitting at traffic lights, its ok to leave it in drive.

 

If the gear was on the D and the car was off, should we turn on the car Then move the car from D to P ؟The gear can be moved when the engine is off؟

 

Engine must be running.

 

The amount of oil required for the gearbox is 8 liters. Some mechanics say that 11 liters should be injected to reach a purity above 90%. I mean, in the end, 8 liters will be in the gearbox.