Oil filter
Catches the grit in your oil. Changed with every oil change.
Signs it's worn: Due for service, oil pressure light.
What's wrong with my car? · Service
What parts do you need for an oil change and basic service?
Usually: Routine service.
For a basic service you want oil and a filter, an air filter, and plugs if they're due.
The parts that fix it
Engine air filter
Keeps dust out of the engine. A five-minute swap you can do in the driveway.
Signs it's worn: Dirty grey filter, sluggish acceleration.
Spark plugs
Fire the fuel in each cylinder. Cheap, and changed every 30-100k miles depending on the plug.
Signs it's worn: Rough idle, misfires, poor mileage, hard starts.
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