Engine Oil Replacement

Warm up the engine.
Remove the drain bolt (A), and drain the engine oil.
K20A3 engine:

Fig 1: Removing Drain Bolt - K20A3 Engine And Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.

K20A2, K20Z1 engines:

Fig 2: Removing Drain Bolt - K20A2, K20Z1 Engines
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reinstall the drain bolt with a new washer (B).
Refill with the recommended oil.
Capacity

K20A3 Engine:

At Oil Change:

4.0 L (4.2 US qt)

At Oil Change Including Filter:

4.2 L (4.4 US qt)

After Engine Overhaul:

5.3 L (5.6 US qt)

K20A2, K20Z1 Engines:

At Oil Change:

4.5 L (4.8 US qt)

At Oil Change Including Filter:

4.7 L (5.0 US qt)

After Engine Overhaul:

5.8 L (6.1 US qt)
Run the engine for more than 3 minutes, then check for oil leakage.