When it comes time for an oil change, one common question drivers ask is whether to use synthetic oil or normal oil (also known as conventional oil). Both types help protect your engine, but they aren’t the same, and knowing the difference can help you make a smart decision for your vehicle and your budget.
At Hawk Subaru, we want our customers to feel confident about car care. In this blog, we’ll break down the differences between synthetic oil vs normal oil, when to use each, and why it matters for your car’s performance.
What Is Normal (Conventional) Oil?
Normal oil is refined from crude oil and has been used in engines for over a century. It provides basic protection by reducing friction and wear between engine parts. For many older vehicles or drivers with simple driving habits (like short trips in mild weather), conventional oil can still get the job done.
However, it breaks down faster under heat and pressure and may not protect your engine as well in extreme conditions or over longer intervals.
What Is Synthetic Oil?
Synthetic oil is engineered in a lab to have a more consistent molecular structure. It’s designed to last longer and perform better under stress, like high temperatures, cold starts, or stop-and-go traffic.
Many Subaru vehicles, especially newer models with turbocharged engines or all-wheel-drive systems, perform better with synthetic oil. It resists sludge buildup, protects the engine more efficiently, and can often go longer between oil changes (depending on your vehicle and driving habits).
Key Differences: Synthetic Oil vs Normal Oil
When comparing synthetic oil vs normal oil, here are the most important differences:
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Longevity: Synthetic oil lasts longer and can go 7,500 to 10,000 miles between changes, while conventional oil may need to be changed every 3,000 to 5,000 miles.
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Temperature Resistance: Synthetic oil handles extreme heat and cold better, which helps your engine run smoothly in Illinois winters and summers.
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Engine Protection: Synthetic oils reduce engine wear more effectively, especially for modern engines or vehicles with heavy use.
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Cost: Synthetic oil is more expensive up front, but it may save money over time with fewer oil changes and better long-term engine protection.
Which Oil Is Right for Your Vehicle?
The best oil for your car depends on several factors, including:
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Your vehicle’s make and model (Subaru often recommends synthetic oil)
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Your driving conditions (frequent short trips, long commutes, towing, or extreme weather)
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Your maintenance preferences (convenience vs. cost)
Check your owner's manual for the manufacturer’s recommendation. If you're still unsure, our team at Hawk Subaru is happy to guide you based on your specific vehicle and driving habits.
Trust Hawk Subaru for Expert Oil Change Service
Whether your car needs synthetic oil or normal oil, keeping up with regular oil changes is one of the most important things you can do to extend your engine’s life. At Hawk Subaru in Joliet, our factory-trained technicians use high-quality oil that meets your vehicle’s exact specifications.
We offer fast, reliable oil change service and transparent advice, so you never have to second-guess what’s best for your car. Schedule your next service appointment today or stop by—we’re always here to help you drive with confidence.
We’re your local Subaru service experts in Joliet, IL.
