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When you invest in a used truck, you're not just buying a vehicle — you're buying a business asset. And just like any business tool, your truck needs proper care to deliver long-term value.
In the world of owner-operators and small fleets, preventative maintenance is the difference between profitable uptime and costly repairs. Whether you’ve just purchased a used Class 8 truck or have been running one for years, staying ahead of maintenance issues is crucial for safety, resale value, and your bottom line.
This guide covers the essential preventative maintenance strategies that every used truck owner should follow in Canada — especially if you want to avoid expensive surprises and keep your truck running longer.
Are you looking for a truck? Look at our used inventory.
Used trucks already have mileage, wear, and possibly some deferred maintenance from their previous owner. If you don’t stay proactive, small issues can quickly snowball into major downtime — costing you income and clients.
Benefits of preventative maintenance include:
Preventative maintenance begins with consistency. You should create a structured maintenance schedule based on hours, kilometers, or calendar intervals — and stick to it.
Typical routine checks include:
Use a maintenance log (digital or paper) to track everything. It’s not just helpful for scheduling — it adds value when it’s time to resell or finance your truck.
Regular oil analysis can reveal early warning signs of engine problems. Pay attention to:
If you notice excessive oil consumption or drops in pressure, don’t ignore it. Book a diagnostic right away.
Brake systems are a top CVSE and DOT inspection failure point in Canada. They're also one of the most critical systems for safety — especially if you’re operating in BC or Alberta's mountainous regions.
Preventative brake tips:
For long-haul trucks, consider doing a full brake system check every 3 months — more often if operating under heavy loads or hilly terrain.
Tires are your contact with the road — and one of the most expensive consumables on a truck.
Key maintenance tips:
Good tires help fuel economy, braking, and reduce risk of blowouts — all major safety and cost factors.
Engines need stable operating temperatures to run efficiently. Canadian winters and mountainous hauling make the cooling system even more critical.
Checklist:
Don't forget the cabin heater — it’s not just comfort, it’s essential for visibility and defrosting in winter.
Modern trucks are heavily reliant on sensors and electronics. A failing sensor can lead to a derate, unexpected shutoff, or misleading engine codes.
If you're buying a truck with warning lights already active, ask for a diagnostic or scan code report.
Beyond oil and fuel filters, don’t forget:
Clean filters reduce engine strain, improve emissions compliance, and contribute to long-term durability.
Preventative maintenance includes catching the unknown. Regular diagnostics help identify:
At Mehmi, we recommend a full scan at least twice a year — or quarterly if you’re financing and want to protect resale value.
Lenders, buyers, and inspectors will all appreciate a clean service history.
Document:
This helps with resale value and can support faster equipment loan approvals if you choose to upgrade later.
Canada’s climate demands winterization and summer prep.
For winter:
For summer:
Visit our Canadian winter maintenance guide for a full seasonal checklist.
One Mehmi customer purchased a 2017 Kenworth with no maintenance records. After six months, a DPF failure and turbo issue sidelined the truck for three weeks — costing $15,000 in lost revenue and repairs.
If regular maintenance and scans had been done, they could have caught the early signs of buildup and saved thousands.
That same truck, after full servicing and documentation, later qualified for refinancing to a better rate with a new lender.
Used trucks are only as reliable as their maintenance schedule. With the right preventative plan, you can keep your rig running for hundreds of thousands of kilometres — safely, profitably, and without major headaches.
Whether you're operating locally in Ontario or hauling long-haul across provinces, your truck is your livelihood. Treat it like an investment, not an expense.
Looking to upgrade, refinance, or start with a truck you can maintain from day one? Speak with a financing expert or explore our used truck inventory today.
1. How often should I change oil on a used heavy-duty truck?
Most used Class 8 trucks require oil changes every 15,000–25,000 km, depending on age and usage. Always follow OEM guidelines and check oil regularly.
2. What’s the most common cause of breakdowns in used trucks?
Neglected emissions systems (DPF, DEF, EGR) and cooling failures are top culprits — both are preventable with routine diagnostics and maintenance.
3. How can I track my maintenance schedule?
Use a paper logbook, maintenance app, or spreadsheet. Include mileage, parts replaced, service dates, and mechanic details.
4. Will good maintenance help me get better financing?
Yes. A well-maintained truck holds its value better and is easier to finance or refinance. Lenders may offer better rates for trucks with detailed service records.
5. Should I do seasonal maintenance in Canada?
Absolutely. Winterization (anti-gel, block heater, battery testing) and summer prep are essential for truck performance and safety.
6. Can I finance maintenance or repairs?
Mehmi offers working capital loans and leaseback options that can help fund major repairs or preventative upgrades.
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