Motor oil is essential for the smooth operation of your vehicle, serving as a lubricant to reduce friction, clean engine components, and protect the engine from wear and corrosion. When it comes to choosing motor oil, drivers are often faced with the decision between synthetic and conventional oil. Both types of oil serve the same fundamental purpose, but they differ significantly in terms of composition, performance, and cost.
Understanding the differences between synthetic and conventional motor oil can help you make an informed decision about which type is best for your car, truck, or SUV. In this blog, we’ll explore the pros and cons of both synthetic and conventional motor oils, so you can choose the one that suits your driving needs.
What is Conventional Motor Oil?
Conventional motor oil, also known as “mineral oil,” is derived from crude oil through a refining process. This type of oil is a natural product that is chemically treated to remove impurities, though it still contains certain natural elements found in crude oil. Conventional oil is commonly used in older vehicles or cars with basic engine designs.
What is Synthetic Motor Oil?
Synthetic motor oil, on the other hand, is man-made through a process that involves refining petroleum and then chemically altering its molecules to create a more uniform and purified oil. Synthetic oils are engineered to have enhanced properties compared to conventional oils, making them highly effective in extreme conditions.
Pros and Cons of Synthetic Motor Oil
Pros of Synthetic Motor Oil
- Superior Performance in Extreme Temperatures
One of the biggest advantages of synthetic motor oil is its performance in extreme temperatures. Synthetic oils are designed to remain stable in both high and low temperatures. In cold weather, synthetic oil flows better, providing quicker lubrication during cold starts, which helps prevent engine wear. In hot weather, it is less prone to breaking down, making it ideal for vehicles subjected to high-stress driving conditions or frequent stops and starts. - Better Protection Against Engine Wear
Synthetic oils offer superior protection against engine wear due to their uniform molecular structure. These oils are less likely to form sludge, which can build up over time in an engine. This leads to a longer engine lifespan and better overall performance, especially for vehicles driven for long distances or in harsh driving conditions. - Improved Fuel Efficiency
Synthetic motor oil is designed to reduce friction, which can improve fuel efficiency. Because the oil flows more smoothly through the engine, the engine runs more efficiently, potentially saving you money on gas in the long run. Synthetic oils also maintain their viscosity better, which means the engine works with less resistance. - Longer Oil Change Intervals
Synthetic motor oil is engineered to last longer than conventional oil before it needs to be changed. This is because it resists oxidation and degradation better, which can allow you to go longer between oil changes (typically around 7,500 to 10,000 miles, depending on your vehicle). This means fewer visits to the mechanic for oil changes, saving time and money. - Better Protection in High-Performance Engines
High-performance and luxury vehicles, as well as vehicles with turbocharged or supercharged engines, often require synthetic oil. Synthetic oils can withstand the higher pressures and temperatures that these engines produce, helping to preserve engine performance and integrity over time.
Cons of Synthetic Motor Oil
- Higher Cost
One of the primary drawbacks of synthetic oil is its higher price point compared to conventional oil. Synthetic oils can be up to twice as expensive as their conventional counterparts. However, when factoring in the longer oil change intervals and better protection, the overall cost may still be justifiable for many drivers. - May Not Be Necessary for Older Vehicles
While synthetic oil offers superior performance, it may not be necessary for older cars or vehicles with simpler engine designs. Conventional oil may be sufficient for older engines that don’t undergo the same level of stress as newer engines, making synthetic oil an unnecessary expense in such cases. - Possible Seal Issues in Older Engines
Some older engines, especially those with high mileage, may have seals and gaskets that are not designed to work with the detergents and chemicals present in synthetic oils. In rare cases, switching to synthetic oil in older cars may cause seals to leak, although this is more of a concern with high-mileage cars that have existing wear and tear.
Pros and Cons of Conventional Motor Oil
Pros of Conventional Motor Oil
- Lower Cost
The most notable advantage of conventional oil is its cost. Conventional motor oil is significantly cheaper than synthetic oil, making it a more budget-friendly option for those who don’t need the advanced protection that synthetic oil offers. If you drive a car with a simple engine and don’t push it to extremes, conventional oil can be a perfectly adequate option. - Suitable for Older Engines
Conventional oil is often better suited for older vehicles that don’t have the advanced features found in newer engines. These vehicles tend to run on lower tolerances and may not require the high-performance benefits provided by synthetic oils. For older, well-maintained cars, conventional oil can be more than enough to keep things running smoothly. - Availability
Conventional oil is widely available and is often stocked in more places than synthetic oil, making it easier to find when it’s time for an oil change. Most quick-lube centres or auto repair shops will have conventional oil readily available, and it may also be easier to find in bulk.
Cons of Conventional Motor Oil
- Shorter Oil Change Intervals
Conventional oil tends to break down more quickly than synthetic oil, which means you’ll need to change it more frequently. Generally, conventional oil should be changed every 3,000 to 5,000 miles. This more frequent maintenance can be a hassle and add up in terms of both time and money. - Lower Performance in Extreme Conditions
Conventional oil performs well under normal driving conditions, but it doesn’t have the high-temperature stability or low-temperature fluidity that synthetic oils offer. In extreme driving conditions, such as long-distance highway driving or stop-and-go city traffic, conventional oil may not provide the same level of protection as synthetic oil, leading to faster engine wear and tear. - Less Effective in Modern Engines
Many newer vehicles are designed with more complex, high-performance engines that benefit from the enhanced properties of synthetic oil. Conventional oils may not provide the level of protection and efficiency required for these advanced engines, leading to reduced performance and potential damage over time.
When to Choose Synthetic vs. Conventional Oil
The decision between synthetic and conventional oil depends largely on your vehicle’s age, engine type, driving habits, and budget. Here are some general guidelines:
- Choose Synthetic Oil If:
- You have a new or high-performance vehicle.
- You frequently drive in extreme temperatures or heavy traffic.
- You want longer intervals between oil changes.
- Your vehicle has a turbocharged or supercharged engine.
- You want to maximize engine performance and lifespan.
- Choose Conventional Oil If:
- You drive an older or less demanding vehicle.
- You have a tight budget and need to keep oil change costs down.
- You drive mostly short trips or have low-stress driving conditions.
- Your car manufacturer recommends conventional oil for your vehicle.
Conclusion: Which One Is Best for You?
Both synthetic and conventional motor oils have their place in automotive maintenance, and the right choice depends on your car’s needs and your personal preferences. Synthetic oils offer superior performance, better protection, and longer oil change intervals, making them ideal for newer vehicles or those used in more demanding conditions. However, conventional oil remains a solid and cost-effective option for older cars or vehicles that don’t require the enhanced properties of synthetic oil.
Ultimately, the best way to decide between synthetic and conventional motor oil is to refer to your vehicle’s owner’s manual. The manufacturer’s recommendation will take into account the specifications of your engine, ensuring that you’re using the right type of oil to maximize performance and engine life.
By understanding the pros and cons of both options, you can make a more informed decision and keep your vehicle running smoothly for years to come.
