I know this gets asked all the time, but there is so much conflicting information out there. I flushed the tranny over the weekend, replace the plug, gasket and filter and since then the levels have been all over the place. I have the special dipstick which has hot (80deg C) and cold (25deg C) readings. From a video I was watching, the car sitting cold should read between the two bars for the 25deg C mark, however the proper way to check the level is with the engine running. As soon as the engine is started, the fluid starts heating up. Not to mention that after the first level reading, there is residual fluid in the tube that will accumulate on the dip stick and throw off your reading. I have also read that you ONLY check the temp when hot. That would mean aligning the level between the two marks for 80degC. Another conflict - someone on mbworld contested that you must check the level in gear and not in park... what? I am really nervous about checking the 722.6 level when hot as that means go drive the car hard for 20mins and then check the levels - what if you overfill, underfill before you take that drive and also... wouldn't that put your oil temps over the 80deg C temp? Hopefully the tranny is more resilient than what my gut is telling me and I won't do much harm until I get the level where it should be. However, can you please advise the CORRECT way (hot or cold, engine running and how long) to check the tranny fluid? Do I need to check the fluid temp on the dipstick with an IR thermometer? It can't really be that hard to figure out, what am I missing?