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Q: How often do you clean/replace the exhaust filter and where is it? on 2009 Chevrolet Silverado 3500 HD

Not a problem/need answer to determine required maintenance.
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The best source is the owner's manual. If you're speaking about the particulate filter, It may be scheduled as regular maintenance at a high mileage. I don't have any significant information on the particulate filter on this vehicle.
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