How many ounces does an OEM Reservior hold of gear lube? 525sc is the motor.

Don't recall exactly but it's around half a quart to fill it to the line. Here is what the drive with the bottles will hold if this helps you.

Fluid Capacities
UNIT OF MEASUREMENT: U.S. Fluid Ounces (Milliliters)
All capacities are approximate fluid measures.
Drive Models) BRAVO ONE, BRAVO TWO, BRAVO THREE,

Drive Unit Oil Capacity
(With Square Gear Lube Monitor)
B1, 88 (2603), B2 104 (3076), B3 96 (2839),

Drive Unit Oil Capacity
(With Round Gear Lube Monitor)
B1 96 (2840), B2 112 (3313), B3 104 (3076),