You do not specify an engine brand or model, but between 1 1/2 and 2qts.
The 2146 does not have an adjustable clutch, some other models do.
HOW DO YOU RESET OIL LIGHT ON CUD CADET
Cub Cadet riding lawn mower's use 30-weight oil. Keeping the oil changed in your Cub Cadet will prolong the life of the mower, and help it run smoothly and efficiently.
Your PTO is not releasing the clutch. Pull the PTO and thoroughly inspect it. It may be that the bearing is seized.
10W-30 motor oil is recommended for use in a Cub Cadet hydrostatic zero turn lawnmower. Any brand of oil is acceptable.
PH2844
2 qt
On the Cub Cadet use Fram PH2844 On the Briggs & Stratton use Fram PH8170
MTD makes all of cub cadet
One and a half quarts
L14476 Purolator
PH4967 :)