---
id: faq-0072
title: "What's the difference between synthetic and conventional oil?"
category: faq
subtopic: service-and-maintenance
page_type: faq
source_url: "https://www.castlechevycars.com"
tags: ["oil", "engine care", "maintenance"]
questions:
  - "Should I use synthetic oil or regular oil?"
  - "Is synthetic oil worth the extra cost?"
  - "What oil type does my car need?"
related: [oil-change, engine-protection, maintenance-schedule]
dealer: Castle Chevrolet of Villa Park
---

Conventional oil is mineral-based and requires more frequent changes (typically every 5,000 miles). Synthetic oil is engineered for superior protection and lasts much longer (often 7,500-10,000 miles or more), performing better in extreme temperatures and reducing engine wear.

Synthetic costs more upfront but often pays for itself through longer intervals and better engine health. Your owner's manual specifies which type your vehicle needs-always follow that guidance.

Castle Chevrolet of Villa Park carries both conventional and synthetic oils, plus the right viscosity for your Chevrolet or other vehicle. Our Service Department can advise you on the best choice for your driving habits and help you maximize engine life. **Call (630) 279-5200** to discuss oil options or schedule your next oil change.