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Be aware that in cold weather the fluid level in a catch tank system increases dramatically it seems.
I checked my fluid levels as my car has been in her batcave for a week and noticed my Forge CatchTank was up to max level:
So I duly emptied the tank - Easy, even for me. Total measured 10 fl.oz / 0.6 pint of gunky fluid:
^ I best warn my daughter it's not a gravy mix or special coffee. Though the aroma will put anyone off!
In the cold weather, although my batcave garage didn't drop below 2C, the amount of gunk suddenly increased.