---
id: faq-0085
title: "When should I replace my air filter?"
category: faq
subtopic: service-and-maintenance
page_type: faq
source_url: "https://www.castlecdjrnaperville.com"
tags: ["air-filter", "maintenance", "engine-efficiency"]
questions:
  - "How often do I need a new air filter?"
  - "What happens if I don't change my air filter?"
  - "How do I know if my air filter is dirty?"
related: [cabin-air-filter, engine-efficiency, maintenance-schedule]
dealer: Castle CDJR of Naperville
---

Your engine's air filter should be inspected every 15,000 miles and replaced every 30,000 miles under normal conditions-more often if you drive in dusty or polluted areas.

**Why air filter replacement matters:**
- A clean filter improves fuel economy
- Protects your engine from dirt and debris
- Improves engine performance and responsiveness
- Prevents damage to internal engine components

**Signs your filter needs replacing:**
- Reduced fuel efficiency
- Reduced engine power
- Black, visibly dirty filter
- Engine running rough or stalling

It's a quick, affordable service that pays dividends. Many vehicles also have a cabin air filter that traps pollen and dust for better interior air quality-we can check both during your visit.

Our Service Team at Castle CDJR of Naperville will inspect your filters and replace them if needed. Call **(630) 864-6683** to schedule your service today.