Every car owner knows the importance of routine oil changes—but when it’s time to make that decision, there’s often one big question: synthetic oil change or conventional oil? If you’re standing in the shop or reading through your manual, wondering which oil is best for your car, you’re not alone. The debate between synthetic and conventional oil has been around for years, and each has its own benefits depending on your vehicle, driving habits, and budget.
At Kerrigan’s Automotive in Petersburg, we’ve helped countless drivers navigate this decision. Let’s break down what you really need to know to keep your engine running at its best.
What’s the Difference Between Synthetic and Conventional Oil?
At first glance, all motor oils might look the same—golden-brown, slippery, and essential. But behind the scenes, there are some key differences.
Conventional oil is refined from crude petroleum. It’s been used in engines for decades and provides basic lubrication and protection. While it does a decent job, it can break down faster, especially in high temperatures or extreme driving conditions.
Synthetic oil, on the other hand, is engineered in a lab. It’s still derived from crude oil, but it’s highly refined and chemically modified to improve its performance. Think of it like comparing regular shoes to high-performance running shoes—both will get the job done, but one is built for optimal results.
The Case for Conventional Oil
Conventional oil is the old-school option, but it still has its place, especially for certain vehicles and budgets.
Pros of conventional oil:
- Lower upfront cost: It’s generally cheaper than synthetic, making it more attractive for drivers looking to save money on maintenance.
- Good for older engines: If your car is from an earlier generation and has always used conventional oil, switching to synthetic may not always be necessary.
- Adequate for low-stress driving: If you mostly drive short distances, avoid high speeds, and live in a moderate climate, conventional oil can perform just fine.
But it’s not without downsides. Conventional oil breaks down quicker under heat, can leave more deposits in your engine, and usually needs to be changed more frequently—about every 3,000 to 5,000 miles.
Why Drivers Choose Synthetic Oil
Synthetic oil is designed for today’s high-performance engines and demanding driving conditions. While it costs more per quart, many drivers consider it worth the investment.
Benefits of synthetic oil:
- Superior engine protection: Synthetic oil is more stable at high and low temperatures, reducing engine wear and extending its life.
- Fewer oil changes: You can often go 7,500 to 10,000 miles between synthetic oil changes, saving time and effort in the long run.
- Improved engine efficiency: Because of its cleaner and more consistent composition, synthetic oil flows better, reduces friction, and helps maximize fuel economy.
- Cleaner engine operation: Synthetic oil resists sludge and deposit buildup, keeping your engine cleaner over time.
This is especially important for newer vehicles, turbocharged engines, and vehicles used for towing, heavy loads, or long commutes.
What About Synthetic Blends?
If you’re looking for a compromise between performance and cost, synthetic blends might be the sweet spot. These oils combine conventional and synthetic bases to offer better protection than conventional oil at a lower cost than full synthetic.
While not as advanced as full synthetic oil, synthetic blends are a good choice for drivers who want extended performance without breaking the bank.
How Your Driving Habits Affect Your Choice
The right oil isn’t just about what your car manual says (although that’s a good place to start)—it’s also about how and where you drive.
- Do you frequently drive in extreme temperatures? Synthetic oil holds up better in hot summers and freezing winters.
- Do you tow or haul heavy loads? The added stress on your engine makes synthetic oil a smarter choice.
- Do you take lots of short trips? Conventional oil may not get hot enough to burn off moisture and contaminants, so synthetic oil’s stability can help.
- Do you do a lot of stop-and-go driving? This wears out your oil faster—again, synthetic has the edge here.
If any of these situations sound familiar, your engine would likely benefit from a synthetic oil change.
Will Synthetic Oil Damage an Older Engine?
This is a common concern—and a bit of a myth. Synthetic oil won’t harm your older engine, but it’s important to proceed with care. If you have an older car with high mileage and it’s been running on conventional oil its whole life, suddenly switching to synthetic could loosen deposits and cause leaks.
That said, there are high-mileage synthetic oils designed specifically for older engines. These contain additives that help protect seals and reduce oil consumption. If you’re unsure, the expert mechanics at Kerrigan’s Automotive can inspect your engine and advise on the best option.
Manufacturer Recommendations Matter
One of the best ways to decide between synthetic and conventional oil is to consult your vehicle’s owner’s manual. Some newer vehicles require synthetic oil due to their engine design. Ignoring this could void your warranty or lead to reduced engine life.
If your manual gives you the option, then the choice comes down to your budget, your driving habits, and how long you plan to keep your car.
At Kerrigan’s Automotive, we can also check your vehicle’s specifications and make a recommendation based on real-world performance, not just what’s written in the manual.
The Bottom Line: Which Is Right for You?
Choosing between conventional and synthetic oil isn’t a one-size-fits-all decision. Here’s a quick breakdown:
Oil Type | Best For | Oil Change Interval | Cost |
Conventional Oil | Older cars, low-mileage drivers, and tight budgets | Every 3,000–5,000 miles | Lower upfront |
Synthetic Blend | Moderate driving needs, balanced performance, and value | Every 5,000–7,500 miles | Mid-range |
Full Synthetic Oil | Newer cars, high performance, long-distanc,e or extreme use | Every 7,500–10,000+ miles | Higher upfront |
Still not sure? That’s where we come in.
Whether your car’s due for a quick oil change or you’re ready to upgrade to full synthetic, Kerrigan’s Automotive is here to help. We’ve been Petersburg’s trusted auto repair shop since 2019, known for fast, honest service and affordable pricing. Our skilled team will recommend the best oil for your vehicle and driving style—no upsells, just expert advice and top-notch service.
Ready to give your engine the care it deserves? Call Kerrigan’s Automotive today or book your oil change appointment online. Your car will thank you.