When it’s time for an oil change, one of the first questions you might face is whether to use conventional or synthetic oil. While both lubricate your engine and help it run smoothly, they’re made differently, perform differently, and may impact your vehicle’s longevity and efficiency. Understanding the key differences between these two types of oil can help you make a more informed decision during your next service.
Let’s explore what sets synthetic and conventional oil apart, and how to choose the right option for your vehicle and driving needs.
How Conventional Oil Is Made
Conventional motor oil is derived directly from crude oil. After being extracted, it’s refined to remove impurities and blended with additives that help protect your engine. This type of oil has been used in engines for decades and remains a common choice, especially for older vehicles or those with low-mileage engines.
Because it’s less processed than synthetic oil, conventional oil typically costs less. However, it also tends to break down faster under extreme conditions and doesn’t perform as consistently at high or low temperatures.
What Makes Synthetic Oil Different
Synthetic oil starts with a base similar to conventional oil but goes through an extensive chemical refinement process. This process removes impurities and creates uniform molecules designed to perform better across a range of conditions. Synthetic oil is also blended with advanced additives that help resist breakdown, reduce engine deposits, and improve flow at low temperatures.
Because of this higher level of refinement and performance, synthetic oil offers better protection, especially in modern engines or those exposed to more demanding driving conditions.
Key Differences in Performance
The performance gap between conventional and synthetic oil becomes clear when you look at a few critical areas:
Temperature resistance
Synthetic oil flows better in cold temperatures and maintains stability in extreme heat, making it ideal for a wide range of climates.
Longevity
Synthetic oil can last longer between oil changes, with many formulations allowing for 7,500 to 10,000 miles of use, compared to the typical 3,000 to 5,000 miles for conventional oil.
Engine cleanliness
Synthetic oil tends to produce fewer deposits, which helps keep internal components cleaner and reduces the risk of sludge buildup.
Wear protection
The uniform structure of synthetic oil molecules provides better lubrication, especially during cold starts or high-speed driving.
When Conventional Oil Might Be Enough
Not every vehicle needs synthetic oil. For older cars with simple engine designs, particularly those driven infrequently or under light loads, conventional oil may provide adequate protection. It’s also a reasonable option if you're on a budget or changing your oil very frequently.
That said, it’s important to follow your manufacturer’s recommendation. Using the wrong oil type can reduce efficiency or void certain warranties, especially if synthetic oil is required.
Choosing Synthetic for Newer or High-Performance Vehicles
Many newer vehicles are designed with tighter engine tolerances and require the superior flow characteristics and stability of synthetic oil. High-performance or turbocharged engines also generate more heat and operate under more stress, making synthetic the better choice.
If you tow frequently, drive long distances, or live in a region with extreme temperatures, synthetic oil provides more consistent protection across these conditions.
Some synthetic oils are specifically formulated for extended drain intervals, which can be especially convenient for drivers who prefer fewer trips to the shop.
Synthetic Blends
If you're torn between the two options, synthetic blends offer a compromise. These oils mix conventional and synthetic base stocks to provide better protection than conventional oil, without the full cost of a full synthetic.
While not as long-lasting or high-performing as pure synthetic oil, blends can offer a good balance of affordability and improved engine protection for many drivers.
Rely on Professional Advice for Your Vehicle
Ultimately, the best oil for your vehicle depends on several factors: the type of engine, your driving habits, your climate, and your maintenance goals. A technician familiar with your vehicle’s specifications can help you choose the right oil type and weight for optimal performance and longevity.
Using the right oil at regular intervals keeps your engine running smoother, longer, and more efficiently, regardless of whether you go with conventional, synthetic, or a blend.
Get Expert Oil Service at Northside Automotive in Montello, WI
At Northside Automotive in Montello, WI, we help drivers make smart maintenance decisions every day. Whether your vehicle needs a basic oil change or you’re curious about switching to synthetic, our experienced team will guide you through the best options for your car.
Stop by today for a professional oil change and leave with confidence, knowing your engine is protected for the miles ahead.