Per engine oil replenishment limit per 400 hours

• A. One quart
• B. Three quarts
• C. Two quarts
• D. Four quarts

Answer: (C)

Two quarts per engine between oil changes is the limit. This means, for each engine, you may add up to two quarts of oil to bring the level back up to the proper range within a 400-hour operating window without performing a full oil change. This cap helps prevent overfilling, which can cause excessive crankcase pressure, foaming, or other oil system issues, while still allowing for normal consumption to be topped up.

Remember this limit is per engine, so each engine has its own two-quart allowance; together you could reach four quarts total μεταξύ both engines, but no more than two quarts on a single engine between oil changes. The other options exceed or fall short of that prescribed limit: adding more than two quarts would violate the limit, while adding less than two quarts may not maintain the correct oil level.