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The engine oil filter removes metal particles, dirt, and combustion byproducts from the oil as it circulates, protecting internal engine components from abrasive wear. Signs that replacement is overdue include: oil that appears very dark and dirty on the dipstick, a filter that is visibly contaminated, or simply exceeding the service interval. Replace the oil filter at every oil change - it is one of the least expensive ways to protect an engine that costs thousands to rebuild.
