Unlike modern "sealed" units, many 236.1-compatible transmissions (like those in the 2000 E240) require a special workshop dipstick to check levels accurately at operating temperature.
Think the W202 C-Class , W210 E-Class , and the 1999 ML320 . (236.1 MB)
It generally corresponds to older, non-synthetic GM specifications like Dexron II-D or Dexron III . Unlike modern "sealed" units, many 236