Preventive maintenance intervals differ sharply across vehicle classes because duty cycles, systems, and regulations change as vehicles get heavier. A light-duty van and a Class 8 tractor need different schedules and different metrics. This guide breaks down typical PM intervals by class so you can set the right schedule for each part of your fleet.
Light-duty (cars, vans, pickups)
Light-duty vehicles mostly run on mileage-based intervals. Follow the owner's manual, adjust for severe use, and use time-based limits for low-mileage units.
Typical items include oil and filter changes, tire rotations, and periodic inspection of brakes, fluids, and filters.
Oil and filter: 5,000 to 7,500 miles or 6 months
Tire rotation: 5,000 to 7,500 miles
Brake inspection: 10,000 to 15,000 miles
Fluids and filters: 15,000 to 30,000 miles
Medium-duty (box trucks, larger vans)
Medium-duty vehicles carry heavier loads and often mix mileage and engine-hour intervals. Service is more frequent than light-duty and includes closer attention to brakes, suspension, and cooling under load.
Many medium-duty commercial vehicles also fall under DOT inspection requirements.
Oil and filter: per OEM, often more frequent under load
Brake and suspension checks: more frequent than light-duty
Cooling and driveline service under manufacturer schedule
DOT annual inspection where applicable
Heavy-duty (Class 7-8 trucks)
Heavy trucks use mileage and engine-hour intervals with detailed OEM schedules. Diesel engines, aftertreatment systems, and air brakes add service items not present in lighter vehicles, and intervals depend heavily on duty cycle.
Layer in DOT annual and periodic inspections and driver daily inspections.
Engine oil and filters: per OEM, by miles or hours
Aftertreatment and DPF service per schedule
Air brake system inspection and adjustment
Greasing chassis and driveline components
DOT annual inspection and daily DVIR
Electric vehicles
EVs across classes skip oil changes and many wear items but add battery and charging-system care. Regenerative braking extends brake life, though brake fluid and other items still need service. Follow the manufacturer's EV-specific schedule.
Tire rotation and inspection on the normal schedule
Brake fluid and cabin filter per manufacturer
Coolant service on models that require it
Battery and charging-system health checks
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❓ FAQ
Why do intervals change by vehicle class?
Heavier vehicles carry more load, use different systems like air brakes and aftertreatment, and face more regulation, all of which demand more frequent and more involved service.
Do heavy trucks use miles or engine hours?
Both. Heavy-duty schedules commonly trigger on whichever of mileage or engine hours comes first, since idling and PTO use add engine hours without adding miles.
How much less maintenance do EVs need?
EVs skip oil changes and have fewer moving parts, so routine maintenance is generally lower, but they still need tires, brake fluid, coolant on some models, and battery care.
Should I always follow the manufacturer schedule?
Use it as the baseline, then shorten intervals for severe duty. Never extend beyond the manufacturer's schedule without good data, especially on warranty-covered vehicles.
What is severe-duty service?
Operation involving heavy loads, stop-and-go, extreme temperatures, dust, or heavy idling. It warrants shorter intervals than the standard schedule across all classes.
Do medium and heavy trucks need DOT inspections?
Commercial vehicles subject to FMCSA rules require a DOT annual inspection plus daily driver inspections, on top of the manufacturer's maintenance schedule.