What is the result of not replacing a worn oil filter?

Not replacing a worn oil filter can lead to increased oil contamination. The primary role of the oil filter is to remove impurities and particulates from the engine oil, which is crucial for maintaining the cleanliness and effectiveness of the oil as it lubricates engine components. Over time, the oil filter becomes clogged with debris, which restricts its ability to filter out contaminants.

When the oil filter is not changed, these contaminants can circulate back into the engine, causing a buildup of sludge and dirt that can impair engine function. This can lead to reduced lubrication and increased wear on engine components, ultimately affecting the engine's overall health and performance. Therefore, neglecting to replace a worn oil filter directly contributes to an increase in oil contamination, which can have detrimental effects on the engine.