Technically, nugent, I'm speaking hyperbolically to try and make a point.
And you're misreading my hyperbole, too. I never said anyone had to use MB branded fluids (good Lord, how could I recommend Shell 134 if that were the case????); rather, the key is to use products of any brand that meet MB spec. I also did not say it would turn the car into a Ford. Rather, I said that carrying a (generic vehicle) mentality towards maintaining a Mercedes (or Porsche or BMW or Ferrari or...) was not going to lead to proper maintenance.
OP...
You can either choose to use MB spec fluids, or you can choose to use something that is not spec. Once you head down the latter path, you're on your own, so to speak. Maybe it will work okay, maybe it won't.
Same thing with technique. Either you can set the fluid level properly with the correct tool, or you can try something else. If your "something else" isn't reliably calibrated back to the proper level, then you risk damaging the transmission or creating other problems with functionality. So if you don't know the offset measurement between the bottom of the pan and the stop-shoulder for the proper tool (which let's face it is $15, why not buy the correct tool?), then you are ultimately just guessing.
OP, neither were you "just askin.'" That is what you did in your FIRST post in this thread, and it was answered pretty quickly. (And actually it was answered in the 722.6xx FAQ sticky long before you posted your inquiry here.) Since then you've simply bounced around in the thread discussing alternatives. (My apologies for the typo from autocorrect, that should have been "buy a case" from a Shell distributor, not "car.")
So you have two choices. Either USE THE SPECIFIED PRODUCTS for your car, or don't.
But continuing a discussion about what else may work is absolutely nonsensical, which is why I reached into the hyperbole drawer and tried to point out the ridiculous other end of your position. Seriously, if you're not going to use MB-spec products, then how do you decide what is okay to use?
If you buy a product that meets MB spec, you KNOW it is okay for the vehicle, right? There are hundreds of variables in fluids (three huge ones in engine oil are shear strength, lubricity and cold-flow characteristics) and engineers specify oils based upon the best combination of factors based upon the design tolerances. Same thing for the transmission, but there you also have to contend with clutches (that don't like lots of lubricity) and valve bodies and...etc.)
Thus, you either use the products that you KNOW meet spec or you start guessing. How do you know whether Dex IV is okay? And if it is, why not Dex III? How about the special fluid that Toyota specifies? Or Honda? Maybe some good old Type A will work fine. How do you decide?
My point, which you seem either to misunderstand or don't want to accept, is that this is YOUR decision. Either you accept the design and technology that went into the car and respect the fluid specifications promulgated by the people that actually built the thing, or you substitute (for that wealth of knowledge) your hunches and some marketing materials, perhaps, maybe price in combination with a coupon discount...and heck, toss in some random opinions from youtube, a car forum or maybe even facebook.
At the end of the day, though, and as I always say, one great thing about owning a car is getting to decide how to maintain it. No one can override your decisions about that. If you want to experiment, please do so and enjoy yourself. But continuing to beat this dead horse serves absolutely no useful purpose.
Good luck.