When it comes time for your next oil change, you’re likely to be asked a familiar question: “Do you want synthetic or conventional oil?” While it might sound like a simple choice, the answer can affect the performance, efficiency, and long-term health of your vehicle. Understanding the difference between synthetic and conventional oil can help you make an informed decision, especially as more modern vehicles are built with synthetic blends in mind.
Let’s explore the key differences between the two types, when you should use one over the other, and how to choose the right oil for your car.
What Is Conventional Oil
Conventional motor oil is derived from refined crude oil and has been used in internal combustion engines for over a century. It contains additives to help prevent sludge buildup, resist oxidation, and reduce wear on engine parts. While it does a good job of lubricating engine components and keeping them cool, conventional oil is more prone to breaking down under extreme heat or pressure, which can result in quicker degradation over time.
What Is Synthetic Oil
Synthetic oil, by contrast, is either chemically engineered or heavily refined to create uniform molecular structures that offer superior performance. These oils are designed to withstand higher temperatures and maintain viscosity over longer intervals. They typically contain fewer impurities than conventional oil and are enhanced with premium additives to further protect your engine.
There are also synthetic blends, which combine conventional oil with synthetic base stock to deliver a balance of performance and affordability. These are often used as a middle ground, especially for drivers who want better protection but don’t need full synthetic oil.
Performance Differences
One of the most noticeable differences between synthetic and conventional oil is how they handle temperature. Synthetic oils resist breakdown in high-heat conditions, making them ideal for engines that operate at higher temperatures or for vehicles used for towing, commuting in extreme climates, or spirited driving.
Cold weather is another area where synthetic oils shine. They flow more easily at startup, meaning your engine is better protected in those crucial first moments after ignition. This can be particularly helpful in places with freezing winters or fluctuating temperatures.
On the other hand, conventional oil tends to thicken in the cold and break down faster under stress. It may be suitable for older engines, infrequently used vehicles, or cars with lower performance demands, but it will usually require more frequent oil changes to maintain the same level of protection.
Longevity and Maintenance Intervals
One of the biggest reasons drivers switch to synthetic oil is the extended oil change intervals. While conventional oil typically needs to be changed every 3,000 to 5,000 miles, synthetic oil can last between 7,500 and 10,000 miles, or longer depending on your driving habits and manufacturer recommendations.
That extended lifespan means fewer oil changes per year, which can offset the higher cost of synthetic oil. While a synthetic oil change may be more expensive upfront, it often balances out in the long run.
It’s important to remember, though, that synthetic oil doesn’t mean you can neglect your oil changes entirely. Dirty oil, even if synthetic, can still harm your engine, especially if the filter becomes clogged or the oil loses its lubricating properties.
Is Synthetic Oil Right for Your Car
Most modern vehicles—especially those made in the last decade—are either designed for synthetic oil or come with manufacturer recommendations to use it. Some turbocharged engines, performance vehicles, or cars with smaller displacement engines operating at higher RPMs are built with synthetic oil in mind.
However, not every engine needs synthetic oil. Older engines with high mileage that have always used conventional oil may not benefit from switching, and in some cases, the switch can even cause oil leaks due to the thinner consistency of synthetic oil. That’s why it’s always best to follow your manufacturer’s specifications or talk to a qualified technician before making the change.
Myths About Synthetic Oil
Several persistent myths about synthetic oil cause confusion. One is that synthetic oil causes leaks. In reality, synthetic oil doesn’t cause leaks but may reveal pre-existing issues in gaskets or seals due to its thinner consistency.
Another myth is that once you switch to synthetic, you can’t go back to conventional oil. That’s not true either. You can switch between the two, although consistency and following your car’s service schedule are more important than the specific type of oil.
There’s also a belief that synthetic oil is only for luxury or high-performance vehicles. While those cars do benefit from synthetic oil, everyday commuter vehicles can also see gains in efficiency, engine protection, and longer intervals between changes.
Let the Experts at David’s Affordable Auto Repair in Fuquay Varina, NC Help You Decide
Choosing the right motor oil shouldn’t feel like guesswork. At David’s Affordable Auto Repair in Fuquay Varina, NC, we take the time to review your vehicle’s needs, your driving habits, and your manufacturer’s recommendations to help you choose between conventional, synthetic, or a synthetic blend.
Whether you're driving an older model or a brand-new vehicle, we’ll ensure your engine receives the protection it needs for reliable performance.
Visit us today for your next oil change and experience honest service and expert care that helps you get the most out of every mile.
