Not that it's a big deal, and I'm not being a turkey; but DEANYEL, my '91 300SE does not have a torque converter drain plug. I bought it new in '91, so it's the original converter. I looked hard for it early on, and when I pulled the tranny to repair the rear main seal on the engine, I put it on the workbench and REALLY looked for it. It just ain't there!!
So, either I got a one-off fluke, or somebody at MB decided we didn't need to drain the converter on this particular model.

Anyway, I've done a lot of 2.75 quart changes in the last 16 years, and it's still working perfect at 175k miles, so I guess I can't complain, saved a lot of $$ on fluid - HeHe.

DG