Preventive Maintenance
PM-A, PM-B, and PM-C each cover more ground than the last, and running them on schedule is what keeps a truck earning instead of sitting in the bay for something that could’ve been caught early. We follow real mileage intervals, not a generic calendar.
Symptoms we see
| Symptom | Likely cause | What we do |
|---|---|---|
| Overdue for oil and filter service | Missed the PM-A interval (roughly every 10,000–15,000 miles) | Oil and filter change, lube, fluid top-off, visual inspection, tire pressure check |
| Brakes, air dryer, or driveline haven’t been checked in a while | Missed the PM-B interval (roughly every 30,000–45,000 miles) | Everything in PM-A plus fuel filters, air filter, brake inspection and adjustment, air dryer service, driveline lube, coolant test |
| Annual inspection or major service is coming due | Missed the PM-C interval (roughly every 90,000–120,000 miles, or annually) | Everything in PM-B plus DOT annual inspection, transmission/differential service, full brake assessment, aftertreatment inspection, cooling system service |
| Aftertreatment failures becoming more frequent | Truck is approaching the 300,000–450,000 mile window where aftertreatment failure rates climb sharply | Add aftertreatment-focused inspection to the PM schedule before it becomes an emergency |
SymptomOverdue for oil and filter service
Likely causeMissed the PM-A interval (roughly every 10,000–15,000 miles)
What we doOil and filter change, lube, fluid top-off, visual inspection, tire pressure check
SymptomBrakes, air dryer, or driveline haven’t been checked in a while
Likely causeMissed the PM-B interval (roughly every 30,000–45,000 miles)
What we doEverything in PM-A plus fuel filters, air filter, brake inspection and adjustment, air dryer service, driveline lube, coolant test
SymptomAnnual inspection or major service is coming due
Likely causeMissed the PM-C interval (roughly every 90,000–120,000 miles, or annually)
What we doEverything in PM-B plus DOT annual inspection, transmission/differential service, full brake assessment, aftertreatment inspection, cooling system service
SymptomAftertreatment failures becoming more frequent
Likely causeTruck is approaching the 300,000–450,000 mile window where aftertreatment failure rates climb sharply
What we doAdd aftertreatment-focused inspection to the PM schedule before it becomes an emergency
What the job involves
PM-A covers the basics — oil and filter, lube, fluid top-off, and a visual inspection — roughly every 10,000 to 15,000 miles.
PM-B builds on that with fuel filters, air filter, brake inspection and adjustment, air dryer service, driveline lube, and a coolant test — roughly every 30,000 to 45,000 miles.
PM-C is the big one — everything in PM-B plus the DOT annual inspection, transmission and differential service, a full brake assessment, aftertreatment inspection, and cooling system service — roughly every 90,000 to 120,000 miles or annually.
For fleets, we can set this up on a schedule so PM happens on mileage or calendar triggers instead of when someone remembers — see /fleet-services for the program-level version of this.
What drives the cost
What this costs depends on which PM tier is due, what the inspection finds beyond the standard checklist, and fleet-scheduled versus one-off service. We tell you after we look at it, before we start.
Common questions
What’s the difference between PM-A, PM-B, and PM-C?
PM-A is the basics — oil, filter, fluids. PM-B adds brakes, air dryer, and driveline. PM-C is the big one — DOT inspection, transmission and differential service, and aftertreatment inspection.
How do I know which PM tier my truck needs?
It’s based on mileage since the last service — roughly 10–15k for PM-A, 30–45k for PM-B, and 90–120k or annually for PM-C. Tell us your last service and current mileage and we’ll tell you where you stand.
Does PM really prevent breakdowns?
Yes — aftertreatment failure rates climb sharply in the 300,000 to 450,000 mile window, and that’s predictable enough to schedule around instead of discovering on the shoulder.
Can you set up a PM schedule for my whole fleet?
Yes — see our fleet services page for scheduled, contract-based PM programs.
What does a PM service cost?
Depends which tier is due and what the inspection finds. We can talk specifics when you call.
Related services
DOT Annual Inspection
The federal DOT annual inspection (49 CFR 396.17) is required on every commercial vehicle every 12 months, and it’s not a formality — brakes, lights, tires, and leaks are what actually fail trucks. We inspect to the real standard, not a quick glance.
Learn more Brakes & Air
Air Brake Repair & Service
Out-of-adjustment brakes are one of the most common reasons a truck fails a roadside inspection — and one of the easiest things to prevent. We inspect and adjust the whole system, not just the pads or shoes that are easy to see.
Learn more
Service area
Ready when you are
Call now or send a quote request — we’ll tell you what it takes to fix it.