Spark plugs ignite the fuel-air mixture in the engine's cylinders and wear gradually with use.
Replacement intervals vary significantly depending on the plug material and engine design. Some plug types are designed to last considerably longer than others.
Because this interval is closely tied to the specific engine and plug specification, it is not something that can be generalized across vehicles.
Your vehicle's spark plug interval is shown on its published schedule once confirmed against manufacturer documentation.
This page explains the service in general terms. It does not state a mileage or time interval, because the correct interval depends on your vehicle's manufacturer, model, year and configuration.
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