---
id: faq-0083
title: "What's the difference between synthetic and conventional oil?"
category: faq
subtopic: service-and-maintenance
page_type: faq
source_url: "https://www.castlecdjrnaperville.com"
tags: ["oil-types", "engine-care", "maintenance"]
questions:
  - "Should I use synthetic oil or conventional?"
  - "Is synthetic oil better?"
  - "What's the cost difference between oil types?"
related: [oil-change, oil-change-intervals, engine-protection]
dealer: Castle CDJR of Naperville
---

Both synthetic and conventional oils protect your engine, but they differ in performance and longevity.

**Conventional oil:**
- Made from crude oil
- Effective for regular maintenance
- Requires more frequent changes (typically every 5,000 miles)
- Lower upfront cost

**Synthetic oil:**
- Man-made, engineered for consistency and durability
- Better performance in extreme temperatures
- Longer change intervals (often 7,500-10,000 miles or more)
- Higher upfront cost, but fewer changes needed

Your owner's manual specifies which type your vehicle needs. Many modern engines run best on synthetic or synthetic blends. Our Service Team can recommend the right oil for your specific vehicle and driving style, balancing performance and value.

Unsure which is right for you? Call Castle CDJR of Naperville at **(630) 864-6683** to discuss your options.