Winter in Ontario can be brutal, with temperatures often dropping well below freezing. For drivers, this means not only battling icy roads but also ensuring that their vehicles are equipped to handle the cold. One crucial aspect of winter vehicle maintenance is choosing the right oil. The freezing temperatures can make engine oil thicker, reducing its ability to flow and properly lubricate engine components. This can lead to wear and tear or even engine failure.
In this blog, we’ll discuss why winter oil is necessary for Ontario’s harsh winter conditions and which types of oil are best suited for cold-weather driving. Making the right choice can extend your vehicle’s lifespan and help it run smoothly even in the most challenging winter conditions.
Why You Need the Right Oil for Winter Driving
When the temperature drops, standard motor oil thickens, making it harder for the engine to turn over and function efficiently. If the oil can’t flow properly, it can’t provide the necessary lubrication to protect your engine’s components. This can lead to increased friction, wear, and in extreme cases, engine damage.
Winter-grade oil, often referred to as “winter oil,” is specifically formulated to remain fluid even in freezing conditions. It allows the oil to flow easily at lower temperatures, ensuring that your engine is protected right from the moment you start your vehicle on a cold morning.
In a place like Ontario, where winter temperatures can fall to -30°C (-22°F) or lower, using the right oil is essential for maintaining your vehicle’s performance and longevity.
Understanding Oil Grades: What Does the “W” Mean?
When choosing oil for winter driving, it’s essential to understand oil grades. You’ve likely seen labels like “5W-30” or “0W-20” on motor oil containers. But what do these numbers mean?
The “W” in the oil grade stands for “winter,” indicating how well the oil will perform in cold temperatures. The number before the “W” represents the oil’s viscosity at low temperatures—the lower the number, the better the oil will flow when it’s cold. The number after the “W” indicates the oil’s viscosity at higher temperatures (typically when the engine is operating).
For example, 0W-20 oil flows better in freezing conditions than 5W-30 oil. This makes lower viscosity oils like 0W-20 or 0W-30 ideal for winter driving in Ontario, as they will provide better protection for your engine during cold starts.

Best Oil Types for Winter Driving in Ontario
Now that you understand how oil grades work, let’s look at the best types of oil for winter driving in Ontario.
Synthetic Oil
Synthetic oil is generally the best option for winter driving because of its superior performance in extreme temperatures. Unlike conventional oil, synthetic oil is engineered to maintain its viscosity across a wider range of temperatures. It flows easily at cold temperatures, making it ideal for Ontario’s harsh winters.
- Recommended Grades for Winter: 0W-20, 0W-30, or 5W-30
- Why It’s Great for Winter: Synthetic oil provides better protection during cold starts and can handle extreme temperature fluctuations, ensuring that your engine remains lubricated and protected.
Synthetic Blend Oil
If you’re looking for a more affordable option, synthetic blend oil is a good compromise. This type of oil combines synthetic and conventional oils to provide better cold-weather performance than standard oil, but at a lower cost than full synthetic.
- Recommended Grades for Winter: 5W-30 or 5W-20
- Why It’s Great for Winter: Synthetic blends offer decent protection in cold weather, although they don’t perform as well as full synthetic oils in extremely low temperatures.
Conventional Oil
While conventional oil is more affordable, it doesn’t perform as well in winter conditions, especially in extreme cold. If you choose conventional oil, you’ll want to opt for a winter-friendly grade, but switching to synthetic or a synthetic blend is generally a better option for Ontario winters.
- Recommended Grades for Winter: 5W-30 or 5W-20
- Why It’s Not Ideal: Conventional oil thickens more in cold temperatures, which can strain your engine during cold starts and reduce lubrication efficiency.
Key Factors to Consider When Choosing Winter Oil
When choosing the best oil for winter driving in Ontario, here are some additional factors to keep in mind:
Vehicle Manufacturer Recommendations
Check your vehicle’s owner’s manual for oil recommendations, especially for cold-weather driving. Many car manufacturers will specify which oil grade is best for winter conditions to ensure optimal engine performance and protection.
Oil Change Frequency
Since cold weather can put extra strain on your engine, consider changing your oil more frequently during winter. This ensures that your engine has fresh, clean oil to help it function smoothly.
Battery and Oil Compatibility
If your car’s battery is weak, it may struggle to crank your engine in cold temperatures, especially if you’re using thicker oil. Ensure that your battery is in good condition, and pair it with the right winter oil to reduce the load on your engine during cold starts.
Tips for Winter Vehicle Maintenance
In addition to choosing the right oil for winter, here are a few tips to ensure your vehicle runs smoothly through Ontario’s cold season:
- Warm Up Your Engine: Allow your engine to warm up for a few minutes before driving, especially on extremely cold mornings. This helps the oil circulate and lubricate engine components effectively.
- Check Tire Pressure: Cold weather causes tire pressure to drop, which can affect handling and safety. Regularly check and adjust tire pressure during winter.
- Keep Your Fuel Tank Full: Keeping your gas tank at least half full can prevent fuel lines from freezing.
Protect Your Engine with the Right Winter Oil
Driving through Ontario’s harsh winters can be challenging, but with the right preparation, your vehicle can handle the cold like a pro. Choosing the best oil for winter driving—such as synthetic oil with a low viscosity rating like 0W-20—ensures that your engine remains protected even in freezing temperatures.
Investing in the proper winter-grade oil will extend your vehicle’s lifespan, improve performance, and help you avoid costly engine repairs. Before the cold hits, make sure your car is equipped with the best oil for winter driving to keep you safe and your engine running smoothly all season long.