level plug vs dipstick transmissions

I've only dealt with 'no dipstick' on two different cars: '14 Fusion and a '22 Accord. On the Fusion, it was a pain because it's behind the driver's wheel. You have to fill the transmission, go drive it to get the fluid warm, park it, jack it up, remove the wheel, then lower it back down so it's level (without the wheel). The Accord was easier as it's accessible without removing anything other than the undershield.
 
I cannot help but wonder: What if you get the temperature slightly wrong, how much could the level possibly vary? A millimeter? More? Less?

Some cars require you to run the engine at idle speed on level ground, until the fan cycles on and off X-number of times. On a cool day, that can take a VERY long time!

Yes the Benz procedure is have the car level and running until the trans fluid sensor says 45C (which you need a scan tool for). Oh, and this is all while the car is up on 4 jack stands with the belly tray removed and you have the fill pump adapter in the hole.

Typically you put 1/2-1 quart of excess fluid in, and then get it hot, remove the plug and let it drain until there a "broken flow."

If you get it wrong you'll be almost immediately reward with harsh shifts.
 
For so many years on the vehicles with no swap out filters I have followed manufacturers "drain and fill" recommendations.
I would use my vacuum pumps to pull fluid out thru dip stick tubes. Refill and drive for a week or so, then evacuate fluid once more and refill... Have not had any transmission / transaxle issues in years.
I did realize one day that every GM vehicle I have ever owned (Chevelles / Monte Carlos / GMC 1/2 ton P/U) except for one ,
my last Chevelle (2006-2019) all required transmission repairs / overhauls. Even the ones I purchased new from dealerships.
Those all had the replacement type filter set ups. I serviced them all and changed those filters and still had issues.
 
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