If a full flow oil filter is completely clogged, what is the likely outcome while the engine is running?

When a full flow oil filter becomes completely clogged, the presence of a bypass valve is a crucial feature that comes into play. This valve is designed to ensure that engine oil can continue to circulate even in the event that the filter is unable to function due to clogging. If the filter is blocked, the bypass valve will open, allowing oil to flow directly from the oil pump to the lubrication system of the engine without passing through the filter.

This mechanism is essential for maintaining engine operation and preventing damage. Without it, oil would not reach the critical parts of the engine, leading to insufficient lubrication. This insufficiency can ultimately result in severe engine damage, as moving parts would not be adequately lubricated, leading to increased friction and heat.

In scenarios where the filter is clogged and the bypass valve functions correctly, the engine continues to receive oil, thereby preventing immediate failure. In contrast, if the bypass valve were to malfunction or if there were no bypass system in place, the consequences would be grave, including the engine potentially seizing due to lack of lubrication. However, the design of a full flow oil filter with an active bypass valve is specifically created to avoid such catastrophic failures.