Digital BW, The Print

The subject may say it all. The bottom line is, I'm a little confused. MIS now has 4-oz bottles 
for the various color positions. Do I still need to dilute these for the C88+? I want to go to a 
variable-density inkset with this printer, instead of the single density Ultratone set.

And if I do need to dilute these, can somebody point me to instructions on how?

Thanks!