Motor oil plays a critical role in keeping your engine running smoothly, reducing friction, and preventing overheating. When it’s time for an oil change, you might wonder: should you go with synthetic or conventional oil? While both serve the same basic function, their composition, performance, and longevity differ significantly.
In this guide, we’ll break down the key differences between synthetic and conventional oil, their pros and cons, and how to determine which one is best for your vehicle.
Conventional oil is derived from crude oil and refined to remove impurities. It has been used in vehicles for decades and remains a popular choice due to its affordability and accessibility.
Conventional oil lubricates engine components to reduce friction and wear. Over time, however, it breaks down due to exposure to heat, pressure, and contaminants, requiring more frequent changes.
✅ Lower Cost – It’s significantly cheaper than synthetic oil, making it a good option for budget-conscious drivers.
✅ Works Well for Older Vehicles – Some older engines were designed to use conventional oil and may not require synthetic alternatives.
✅ Easier Availability – Found in nearly all auto repair shops and gas stations.
❌ Breaks Down Faster – More susceptible to heat and oxidation, requiring frequent oil changes.
❌ Less Effective in Extreme Temperatures – Performance decreases in very hot or cold weather.
❌ More Engine Deposits – Over time, conventional oil can form sludge and deposits, which may impact engine efficiency.
Synthetic oil is engineered in a lab using chemically modified petroleum components and artificial additives. It is designed to provide superior lubrication, reduce engine wear, and enhance overall performance.
Unlike conventional oil, synthetic oil contains fewer impurities and is formulated to withstand extreme temperatures, high pressures, and long operating periods without breaking down.
✅ Longer Oil Change Intervals – Can last 7,500 to 15,000 miles between changes, depending on the vehicle and oil type.
✅ Superior Engine Protection – Reduces wear and tear by maintaining viscosity and lubrication under high stress.
✅ Better Performance in Extreme Temperatures – Flows easily in cold weather and resists breaking down in hot conditions.
✅ Keeps the Engine Cleaner – Contains fewer impurities, reducing sludge buildup and deposits.
✅ Potentially Improves Fuel Efficiency – Reduces friction, which can lead to better mileage over time.
❌ Higher Cost – More expensive than conventional oil, though longer change intervals may offset the cost.
❌ May Not Be Necessary for Older Engines – Some older vehicles were designed for conventional oil and may not benefit significantly from synthetic oil.
For drivers who want some benefits of synthetic oil without the higher price tag, synthetic blends are a great option. These oils combine conventional oil with synthetic additives to improve performance and longevity while keeping costs reasonable.
The best oil for your car depends on various factors, including your driving habits, climate, and manufacturer recommendations.
✔️ If you have an older vehicle without high-performance requirements.
✔️ If you’re on a tight budget and don’t mind more frequent oil changes.
✔️ If you drive mainly in mild weather conditions and don’t put heavy stress on your engine.
✔️ If you drive a newer or high-performance vehicle.
✔️ If you frequently drive in extreme heat or cold.
✔️ If you tow heavy loads or engage in stop-and-go traffic often.
✔️ If you want to extend the time between oil changes.
Your owner’s manual will specify the type of oil that works best for your engine. Many modern vehicles are designed to run on synthetic oil, while older ones may work just fine with conventional oil.
🚫 Myth: You Must Stick to One Type of Oil Forever
🔹 Fact: Switching from conventional to synthetic (or vice versa) won’t harm your engine as long as you use the correct viscosity and manufacturer-recommended type.
🚫 Myth: Synthetic Oil Causes Leaks
🔹 Fact: Older synthetic oils sometimes caused leaks in high-mileage vehicles, but modern synthetic formulations contain additives that help condition seals and prevent leaks.
🚫 Myth: Conventional Oil Is Just as Good as Synthetic
🔹 Fact: While conventional oil provides adequate lubrication, synthetic oil lasts longer, withstands extreme conditions better, and offers superior engine protection.
The actual interval depends on your vehicle’s recommendations and your driving conditions. Stop-and-go traffic, towing, and extreme temperatures may require more frequent changes.
Regular oil changes are essential to keeping your engine in top shape. Whether you choose synthetic, conventional, or a blend, Hiller Automotive offers expert oil change services to match your vehicle’s needs.
📅 Schedule an appointment today and keep your engine running at its best!
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