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How do I know if my car's air filter needs to be replaced

You can usually tell if your car's air filter needs replacing by checking for a few signs. If you notice a drop in engine performance, reduced fuel efficiency, or if the engine is running rough, it might be time to swap it out. Also, if the filter looks dirty or clogged when you take a peek at it, that’s a pretty good indicator too. Most mechanics recommend checking it every 12,000 to 15,000 miles, so keep that in mind!