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1. Stay on Top of Regular Servicing
This one sounds obvious, but off-road driving accelerates wear on components that don't get the same attention as engine oil or brakes. The drivetrain, differentials, wheel bearings, and transfer case all take significantly more punishment on unpaved terrain than they do on the highway.
Following your manufacturer's recommended service intervals is the minimum. If you're regularly taking your vehicle off the pavement, consider shortening those intervals accordingly.
Pay particular attention to differential and transfer case fluid changes. These are easy to forget because they don't appear on many standard service checklists, but they play a direct role in how your 4WD system performs and how long it lasts.
Your service advisor at Terra Nova Buick GMC can help you build a maintenance schedule that reflects how you actually use your vehicle.
2. Check Your Tires Before and After Every Off-Road Trip
Your tires are the only part of your vehicle in contact with the ground — and off-road terrain is significantly less forgiving than pavement. Before any off-road trip, check pressure, tread depth, and overall condition on all four tires and the spare.
When you're off the pavement, lower tire pressure improves traction by increasing the tire's contact patch with the surface. As a general guide:
- Mud — 18–22 PSI
- Rocks — 20–25 PSI
- Sand or soft ground — 12–18 PSI
Reinflate to your vehicle's recommended road pressure before returning to paved roads. Underinflated tires on the highway generate excess heat, increase wear, and compromise handling. Check the sticker inside your driver's door jamb for the correct road pressure for your specific vehicle.
Rotate your tires every 10,000 to 12,000 kilometres to promote even wear. Off-road driving accelerates uneven wear patterns, and regular rotation extends tire life significantly.
3. Inspect Your Suspension Regularly
Your suspension system absorbs every rock, rut, root, and rough patch you drive over. Signs that your suspension needs attention include leaking shock absorbers, a noticeably bouncier or rougher ride than usual, the vehicle sitting lower on one corner, or clunking and squeaking sounds when driving over uneven surfaces.
Don't wait for a dramatic failure to address suspension wear. A compromised shock absorber doesn't just affect comfort. It reduces tire contact with the ground, which directly impacts traction and braking on the unpredictable surfaces where you need both the most.
Book a suspension inspection at Terra Nova Buick GMC after any particularly demanding off-road trip, or any time your vehicle's ride quality changes noticeably.
4. Clean the Undercarriage After Every Trip
Mud, salt, and sand that cakes onto the undercarriage don't just look bad. They trap moisture against metal surfaces and accelerate rust from the inside out, attacking your frame, suspension components, brake lines, and fuel lines in ways that are invisible until the damage is already done.
In Newfoundland, where coastal salt air compounds road salt exposure, undercarriage corrosion is an accelerated concern. After any significant off-road trip, use a high-pressure hose to thoroughly flush the undercarriage, wheel wells, and radiator, but avoid directing high-pressure spray at seals, sensors, or electrical connections. A proper undercarriage wash at a commercial facility that offers this service provides the most thorough coverage.
5. Know Your 4WD System and Use It Correctly
Your GMC's 4WD system is designed with specific operating parameters, and using it incorrectly is one of the fastest ways to cause unnecessary wear or damage. Understanding when to engage 4WD High or 4WD Low, how locking differentials work, and what your traction control system is actually doing underneath you makes you a more capable off-road driver and a kinder one to your vehicle.
As a general rule, 4WD High is for loose, slippery, or unpaved surfaces at normal driving speeds, like gravel roads, snow, or mud. 4WD Low is for very slow-speed, high-demand situations like steep rocky descents, deep mud, or recovery situations.
Don't engage 4WD Low on paved roads or at highway speeds. If your GMC has Hill Descent Control, use it on steep downhill terrain rather than riding the brakes. It modulates braking more precisely than manual application and is easier on your brake components over time.
If you're new to 4WD driving, practice engaging and using these systems in a low-stakes environment before taking on more demanding terrain.
Book Your Service Appointment at Terra Nova Buick GMC
Whether your vehicle is due for its next service interval, you've just returned from a demanding off-road trip, or you want a full inspection before your next adventure, our service team at Terra Nova Buick GMC in St. John's is here to help. Book your appointment online or give us a call at 1-(800)-463-4130.
