Common Misconceptions About Heavy-Duty Vehicle Maintenance Debunked

Just because some random person once told you something at a truck stop doesn’t make it true. Although most myths in the trucking world are harmless nonsense, some can be genuinely dangerous. But what separates fact from fiction? 

Well, at RTC, we’ve seen our fair share of misguided beliefs that can lead to costly mistakes. So, we’re here to clear up some of these common misconceptions once and for all.

Misconception 1: “Maintenance Schedules Are Just Recommendations.”

Many truck owners and operators believe the maintenance schedule is merely a suggestion, not mandatory. This couldn’t be further from the truth. Regular maintenance is essential for the longevity and efficiency of your vehicle. 

Following the manufacturer’s maintenance schedule ensures that your truck operates at peak performance and helps prevent costly breakdowns on the road. Skipping scheduled maintenance can lead to a domino effect of issues. For instance, neglecting oil changes can cause engine components to wear out faster, leading to increased fuel consumption and engine failure. 

Sticking to a maintenance schedule may seem costly and time-consuming. But trust us, what you save in repair costs and downtime, it will seem like pennies. 

Misconception 2: “Diesel Engines Don’t Need As Much Attention as Gas Engines.”

While diesel engines are built to be more durable and handle heavier loads than their gasoline counterparts, this doesn’t mean they don't need looking after. 

Diesel engines require regular attention to stay in top condition. Components such as fuel injectors, turbochargers, and EGR (Exhaust Gas Recirculation) systems need regular inspections and servicing to prevent performance issues.

For example, fuel injectors in diesel engines operate under extremely high pressure and can become clogged with debris over time, leading to poor fuel economy and increased emissions. Regularly scheduled maintenance, including fuel system cleaning, is essential to smooth operations and avoid fines related to environmental compliance.  

Misconception 3: “Using Cheaper Parts and Fluids Saves Money.”

It’s a common belief that opting for cheaper parts and fluids is a good way to save money on maintenance. Although initially, this might seem like a great way to cut costs, this approach often backfires. 

Cheaper parts and fluids can wear out faster and fail to perform as well as high-quality alternatives. This leads to more frequent replacements and potential damage to your vehicle, both of which negatively impact your bottom line.

For instance, low-quality oil can break down more quickly, failing to provide adequate lubrication and protection for your engine. This can result in increased wear and tear on engine components, ultimately leading to costly repairs or engine failure. Investing in high-quality parts and fluids is crucial for maintaining the longevity and reliability of your heavy-duty vehicle.

Misconception 4: “You Only Need to Check Your Brakes When They Make Noise.”

Relying on brake noise as an indicator for maintenance is a dangerous misconception. By the time they’re making noise, they’re already in poor condition and won’t be performing at their best. This is why professional preventive maintenance is so important!

Heavy-duty trucks use air brake systems subject to rigorous use and requiring regular checks. Components such as the air compressor, brake chambers, and slack adjusters should be inspected frequently to ensure they are functioning correctly. Waiting until you hear a noise to check your brakes could mean putting yourself and others at risk.

Misconception 5: “Cooling Systems Don’t Need Regular Maintenance.”

Many drivers overlook the importance of maintaining their cooling systems. However, a well-functioning cooling system is crucial to prevent engine overheating and subsequent damage. Regularly checking coolant levels, inspecting hoses for leaks, and ensuring the radiator and cooling fan are in good condition can prevent overheating issues.

Neglecting your cooling system can lead to catastrophic engine damage. For example, if the coolant level is low, it can cause the engine to overheat, leading to warped cylinder heads or a blown head gasket. Routine cooling system maintenance helps avoid costly repairs and keeps your engine running efficiently​​.

Misconception 6: “Modern Trucks Don’t Need Preventive Maintenance.”

With modern technology and advanced diagnostics, some believe preventive maintenance is a thing of the past. However, even with sophisticated systems, regular maintenance is still essential. While technology can help identify issues early, it cannot replace the need for physical inspections and regular servicing.

Preventive maintenance includes tasks such as oil changes, tire rotations, and filter replacements, which are critical to your vehicle's overall health. Regardless of how advanced your truck's technology might be, ignoring preventive maintenance can lead to unexpected breakdowns and costly repairs.

Check out our article to learn more about how to set up a preventive maintenance checklist that lasts!

Frequently Asked Questions

How often should I change the oil in my heavy-duty truck?

Oil change intervals for heavy-duty trucks can vary based on the type of oil used and the operating conditions. However, changing the oil every 10,000 to 15,000 miles is a good rule of thumb. Always refer to the manufacturer’s recommendations and consult a professional mechanic to determine the best schedule for your vehicle.

What are the signs that my diesel engine needs maintenance?

Common signs that your diesel engine needs maintenance include reduced fuel efficiency, excessive exhaust smoke, difficulty starting, and unusual engine noises. Regular professional inspections and maintenance can help identify and address these issues before they lead to more severe problems.

Can I use regular motor oil in my diesel engine?

Diesel engines require specific types of oil designed to handle the higher pressure and temperature conditions under which they operate. Using regular motor oil can lead to inadequate lubrication and potential engine damage. Always use oil that meets the specifications recommended by the manufacturer.