What Type of Engine Oil Should You Use in Your Car?

Valerie Raskovic

Apr 15, 2025

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With so many different types of engine oils for sale choosing the right oil for your car can be a bit tricky. Considering the fact that the engine oil has a direct effect on engine performance and reliability it is crucial for extending the life of your vehicle. Engine oil lubricates the moving parts of the engine, reduces friction, and helps keep the engine clean and cool.

In recent years, many manufacturers have switched to 0W oil to improve fuel efficiency but this change comes with its own set of considerations and potential drawbacks. This article will guide you through the factors to consider when selecting the right engine oil for your car, including the benefits and drawbacks of new 0W oil.

Understanding Engine Oil Viscosity

The first thing we must do is understand engine oil viscosity and how it is measured. The viscosity grade is typically indicated by a number followed by the letter "W" (for winter) and another number, and it represents thickness and flow rate. For example, 5W-30 indicates that the oil has a viscosity of 5W in cold temperatures and 30 in hot temperatures. The "W" grade is important because it ensures the oil flows properly at low temperatures to protect the engine during cold startup.

The Rise of 0W Oil

Many modern car manufacturers have started recommending 0W oil, particularly 0W-20 and 0W-30, for their vehicles. The primary reason for this shift is to improve fuel efficiency. Here are some key points to consider:

Benefits of 0W Oil

1. Improved Fuel Efficiency & Performance:

• • Reduced Friction: 0W oil is thinner and reduces resistance. This can lead to better fuel economy, which is especially important for manufacturers trying to meet stringent fuel efficiency standards.
  
  
  • Cold-Start Protection: The low viscosity of 0W oil allows it to flow quickly to critical engine components during cold starts, providing immediate protection.
  
  
  • Normal Heat Dissipation: 0W oil can help dissipate heat more effectively, which is beneficial for high-performance engines.

Drawbacks of 0W Oil

1. Potential for Increased Wear:

• • Thinner Film: The thinner nature of 0W oil can result in a thinner protective film covering vital moving parts. This can potentially lead to increased wear over time, especially in older or high-mileage engines.
  
  
  • Seal Compatibility: Some older engines may not be designed to handle the thinner oil, which can lead to leaks or other issues with seals and gaskets. Do not use a 0W oil if your vehicle was not designed for that type of modern synthetic oil.

2. Cold Weather Performance:

• • Viscosity at Extreme Temperatures: While 0W oil flows well in cold temperatures, it can become too thin in extremely hot conditions, potentially leading to reduced protection for the engine. It is not uncommon to have premature engine failure in vehicles with 0W oil which are being used in extremely hot climate or on the racetrack. This is the reason why race cars generally do not use 0W oils.

3. Cost and Availability:

• • Higher Cost: 0W oil is a synthetic oil requiring more refining than conventional oils and typically carries a higher price tag.  

Factors to Consider When Choosing Engine Oil

1. Manufacturer Recommendations:

• • Owner’s Manual: Always check your car’s owner’s manual for the manufacturer’s recommended engine oil type. This is the best starting point for ensuring you use the right oil.
  
  
  • Service Intervals: Do not exceed recommended service intervals for oil changes to maintain optimal engine performance. Generally, changing synthetic oil every 5,000 miles helps ensure optimal engine performance. While this interval is often shorter than many manufacturer recommendations, it provides added protection by preventing potential oil starvation if the engine is consuming oil. Regular oil changes also ensure the engine always has clean oil, which supports efficient and reliable operation.

2. Vehicle Age and Condition:

• • High-Mileage Vehicles: Older or high-mileage engines may benefit from higher viscosity oils, such as 5W-30 which can provide better protection against wear. Some newer engines are designed with smaller oil passageways which are specifically made for very thin oils like 0W-30. So, switching to a heavier oil may not always be an option. We advise that you consult with your trusted local mechanic about your specific year, make and model vehicle before making the switch to a thicker viscosity oil.

3. Driving Conditions:

• • Climate: Consider the climate in which you drive. If you live in an area with extreme cold or hot temperatures, you may need to adjust the oil viscosity accordingly.
  
  
  • Driving Style: Aggressive driving or frequent short trips can put more strain on the engine, which may require a higher viscosity oil for better protection. Additionally, if you are doing any kind of towing that may put extra strain on your engine components.

4. Synthetic vs. Conventional Oil:

• • Synthetic Oil: Synthetic oils offer superior performance and protection, especially in high-performance or severe driving conditions. They are more expensive but can last longer and provide better protection. If you intend to switch from 0W oil to a higher viscosity oil, it is best to use synthetic oil as most 0W oils are synthetic and it is not advised to go from a synthetic to a conventional oil.
  
  
  • Conventional Oil: Conventional oils are less expensive and can be a good choice for older vehicles which do not require synthetic engine use by the manufacturer.

Choosing the right engine oil for your car is a critical decision that can affect its performance, longevity, and fuel efficiency. While many manufacturers have switched to 0W oil to improve fuel economy, it is important to consider the potential drawbacks, such as increased wear and seal compatibility issues. Always consult your car’s owner’s manual and consider your vehicle’s age and driving conditions when selecting the appropriate oil.