How much oil do you use to flush the engine?

Flushing an engine typically involves using the same amount of oil as the engine's oil capacity. The purpose of flushing the engine is to remove any contaminants and residue that may have accumulated inside the engine over time, such as old oil, dirt, metal shavings, and sludge.

Therefore, it's recommended to use the full oil capacity for effective flushing. This allows the flushing oil to circulate throughout the entire engine system and effectively clean and remove any harmful substances. Using less oil may not sufficiently lubricate the engine during the flushing process, which could lead to unnecessary wear and tear on engine components.