The transmission is a sealed system, if you're having to add fluid it means you have a leak. the 1999 CLs are notorious for transmission problems, get it to a transmission place asap. I had to have my transmission rebuilt, hopefully yours just needs a minor repair.
$30
through the dipstick or a plug sitting on top of the tranny somewhere
how do you add transmission fluid on 98 acura cl 3.0
26.3962989 Imperial fluid ounces
About 11.16 US fluid ounces.
If by cl it is centiliter, then 20 cl = 0.2 liter = 6.762791748 fluid ounces. See related link.
5 cl = 1.69070114 US fluid ounces
1 litre = 100 cL so 3.33... cups of 30 cL each.
20 cl = 6.76 US fluid ounces
150 cl = about 51 (50.7210341) US fluid ounces.
1 US fluid ounce = about 3 (2.95735296) cL
8 US fluid ounces = 23.7 (23.6588236) cL