---
id: guide-0013
title: "Which fluids and filters does my vehicle need, and on what schedule?"
category: guide
subtopic: maintenance-fluids
page_type: guide
source_url: "https://www.castlecdjrchesterton.com"
tags: ["maintenance", "fluids", "filters", "preventive care"]
questions:
  - "What fluids does my car need?"
  - "How often should I change my oil?"
  - "When do air filters need replacing?"
  - "What about transmission fluid and coolant?"
related: [maintenance-schedule, maintenance-brakes]
dealer: Castle CDJR of Chesterton
---

## Essential Fluids and Filters

**Engine Oil & Filter**  
Most vehicles need an oil change every 3,000-10,000 miles (check your manual). Synthetic oils often last longer.

**Coolant**  
Keeps your engine temperature stable. Usually flushed and replaced every 30,000-100,000 miles.

**Transmission Fluid**  
Essential for smooth shifting. Replacement intervals vary widely-your owner's manual is your guide.

**Brake Fluid**  
Absorbs moisture over time and should be flushed periodically to maintain braking safety.

**Air Filter & Cabin Air Filter**  
Both trap dust and debris. Air filters typically need replacement every 15,000-30,000 miles; cabin filters every 12,000-15,000 miles.

**Power Steering & Windshield Washer Fluid**  
Check and top up regularly; replace steering fluid per your maintenance schedule.

**Next step:** Your owner's manual has the exact schedule for your model. Our Service Department can create a personalized maintenance plan-call (219) 250-9487 to get started.