September 5, 2023

How to Prepare Your Diesel Truck For Cold Weather

There is no denying that cold weather can be a challenge for any business running a diesel truck fleet. With temperatures dropping and snow on the road, you might experience no-starts, or worse, sliding and skidding on the road. As a diesel truck owner, it’s paramount you prepare your diesel truck with everything it needs to withstand the challenges of the cold weather. 

Whether you're a fleet manager responsible for a fleet of diesel trucks in the logistics industry or an owner-operator making a living contract to contract, taking the necessary steps to prepare your diesel truck for winter will help you avoid potential issues and keep your operations running smoothly. In this comprehensive guide, we will delve into specific measures you can take to safeguard your diesel truck against the harsh conditions of cold weather.

How Cold Weather Affects Diesel Trucks

Cold weather presents unique challenges for diesel trucks. Freezing temperatures can thicken diesel fuel, making it harder to ignite and potentially leading to starting problems. Additionally, the cold weather can impact various truck components, including the battery, engine oil, filters, coolant, glow plugs, tires, and structural components. Understanding how cold weather affects these crucial systems will empower you to take proactive measures to mitigate potential issues and ensure the optimal performance of your diesel truck during winter.

Preparing Your Diesel Truck For Cold Weather

As the age-old saying goes, it’s better to be safe than sorry. Preparation is key to ensuring your diesel truck remains reliable and efficient in cold weather conditions. By following these essential tips, you can fortify your truck to brave the winter elements without a hitch.

Check Your Anti-Freeze Coolant (ATC)

Your truck's coolant/antifreeze plays a vital role in maintaining the engine's temperature and preventing it from freezing. Cold weather can cause coolant to freeze or lose effectiveness, leading to engine damage. To protect your engine, check the concentration and condition of the coolant/antifreeze using a refractometer or test strips. Also, we recommend you ensure that the mixture is suitable for sub-zero temperatures, as recommended by your truck manufacturer.

Consider flushing and replacing the coolant if it's nearing the end of its service life or if there are signs of contamination. Flushing the coolant system removes any debris or contaminants that can hinder its performance, and it will help maintain the quality of the coolant which is essential in preventing freezing in the various parts of your engine.

Inspect Glow Plugs and Install an Air Intake Heater

Cold weather can pose challenges when starting a diesel engine—failing or low-quality glow plugs may result in hard starts or no-starts in cold temperatures. To address this, inspect the glow plugs for proper functionality. Glow plugs are responsible for heating the air in the combustion chamber and thus assisting ignition during cold starts, which is why replacing any defective or worn-out glow plugs prior to the change of seasons will ensure reliable starting performance.

Installing an air intake heater is another effective way to improve cold weather starting, especially if you’re frequently driving in colder regions. An intake heater warms the air entering the engine, promoting easier and faster starts in cold conditions, while reducing the strain on the glow plugs by preheating the air, aiding combustion and improving overall engine performance in chilly weather.

Switch to a Lower Viscosity Oil

Choosing the right engine oil is crucial for ensuring optimal lubrication and protection during cold starts. Switching to a lower viscosity oil, such as 5W-40 or 0W-40, at colder temperatures, allows the oil to flow more easily, reducing friction and wear during startup. This improved flowability ensures that vital engine components receive proper lubrication, even in frigid conditions.

Different types of engine oils are available, including conventional, synthetic, and synthetic blends. Synthetic oils offer superior performance and stability at extreme temperatures, making them an excellent choice for cold-weather applications. Consult your truck's manual or speak with a qualified technician to determine the most suitable engine oil for your specific diesel truck model and anticipated winter conditions.

Check Your Tires

Tire maintenance won’t only help extend the life of your tires, but it will also help you run a safe and efficient operation during the winter. Start by inspecting your tires for wear, ensuring that the tread depth meets legal requirements—adequate tire tread depth is essential for traction on slippery and icy surfaces. Consider switching to winter tires if you frequently operate in regions with heavy snowfall, as they are specially designed to provide enhanced grip and handling in cold and snowy conditions, maximizing your truck's stability and control. 

Additionally, check the sidewalls of your tires for any signs of damage or bulges. Cold temperatures can cause tire pressure to decrease, leading to underinflated tires. Proper tire inflation is crucial for maintaining optimal handling, fuel efficiency, and tire longevity. Make sure you regularly monitor tire pressure and ensure it matches the manufacturer's recommendations, accounting for any adjustments necessary in cold weather.

Test Your Battery

Extreme cold can significantly affect the efficiency of your truck's battery. Before winter arrives, we suggest you perform a thorough battery inspection. You can start by cleaning the battery terminals and connections to ensure good electrical contact, followed by testing the battery's voltage and conducting a load test to assess its capacity and ability to deliver power in cold conditions. If your battery shows signs of weakness or struggles to start the engine promptly, consider replacing it with a battery designed for cold weather performance. A reliable and powerful battery is essential for consistent starts and electrical system performance during winter.


Preparing your diesel truck for cold weather is a proactive step to safeguard its performance, reliability, and your own safety during the winter months. By checking your coolant, inspecting glow plugs, switching to the appropriate engine oil, maintaining your tires, and testing your battery, you can ensure your truck operates optimally in freezing temperatures. Don't let the cold weather catch you off guard—take the necessary measures to protect your investment and keep your operations running optimally.. Trust the experts at The Service Company for all your heavy-duty truck repair and maintenance needs. Contact us today and let our skilled technicians ensure your diesel truck is ready to conquer the challenges of winter.

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