Articles | Gallaher Fleet Solutions

Truck fleet maintenance FAQs: straight answers on inspections, records, intervals and service

Written by Joe Gallaher | Nov 11, 2026, 10:59:26 PM

These are the questions fleet managers ask us most often, with straight answers. Where an answer comes from a federal rule, we link to it. Where a number is our recommendation, we say so; your engine and transmission makers' manuals still set the limits for your specific trucks. For questions about diagnostic costs, downtime and judging a shop's work, see our Fleet Manager Q&A.

Compliance and inspections

How often does a commercial truck need an annual DOT inspection?

At least once every 12 months. Under FMCSA rule 49 CFR 396.17, a carrier may not use a commercial vehicle unless it has passed a periodic inspection within the preceding 12 months, with documentation on the vehicle. That applies to each vehicle in a combination, so the tractor and each trailer need their own inspection.

Who is allowed to perform the annual inspection?

Someone who meets FMCSA's inspector qualifications. Under 49 CFR 396.19, the inspector must understand the inspection criteria, be able to identify defective components, and have completed a qualifying training program or have at least one year of relevant training or experience. The carrier must keep evidence of those qualifications. If you use an outside shop, ask how it documents its inspectors' qualifications.

Who is allowed to work on our trucks' brakes?

Anyone responsible for brake inspection, maintenance or repair must be qualified by training, a state or federal certificate, or at least one year of brake-related training or experience, under 49 CFR 396.25. That applies whether the work is done in your own shop or by a vendor.

What maintenance records do we have to keep, and for how long?

49 CFR 396.3 requires records for each vehicle that identify it, show the nature and due date of inspection and maintenance work, and record the inspections, repairs and maintenance done. Keep them where the vehicle is housed or maintained for one year, and for six months after the vehicle leaves your control.

How long do we keep driver vehicle inspection reports?

Three months from the date the report was prepared, along with the certification of repairs and the driver's review, under 49 CFR 396.11. Drivers do not have to prepare a report if they find no defect.

What gets trucks placed out of service most often?

Brakes, by a wide margin. In the Commercial Vehicle Safety Alliance's 2025 International Roadcheck, brake-related problems accounted for 41.1% of vehicle out-of-service violations. Tires, lights and cargo securement were the other most common causes. Our post on driver pre-trip and weekly checks covers how to catch them first.

Service intervals

How often should the transmission and clutch be checked?

We recommend every 12,500 miles. The clutch wears with every engagement, and a regular check catches adjustment problems and leaks early.

How often should the DPF be checked?

We recommend every 300,000 miles, and sooner for trucks that idle a lot, run short stop-and-go routes or have started regenerating more often.

How often should we change the oil?

It depends on the engine, the oil and how hard the truck works. Start with the engine maker's schedule for your duty cycle, and use oil analysis to confirm it. An oil change itself takes 15 to 45 minutes in our shops, and most oil and fluid visits are turned around the same day.

Should we schedule maintenance by miles or engine hours?

Use mileage for trucks that run steady routes, and engine hours for trucks that idle or run equipment while parked. Many fleets use whichever comes first.

Working with Gallaher Fleet Solutions

Which trucks do you service?

Class 4 to 8 trucks and trailers: light, medium and heavy-duty, all makes and models. That includes brakes, PMs, DOT inspections, diagnostics, engine, transmission, emissions and electrical work, trailer repairs, light body repairs, and Moffett repair and maintenance.

Where are your shops?

We have three shops in North Carolina: Statesville (945-A Monroe St, Statesville, NC 28677), Bessemer City (3715 Dallas Cherryville Hwy, Bessemer City, NC 28016), serving Gastonia and Gaston County, and Monroe (2203 Stafford Street Ext, Monroe, NC 28110).

Can you come to us?

Yes, for many jobs. Our mobile units handle on-site preventive maintenance, DOT inspections, DOT-related repairs, shorter repairs and diagnostics on check engine and warning lights. Larger repairs come into the shop.

Do you offer emergency service?

Yes, at all three shops, Monday to Friday, 7:00 AM to 5:00 PM, on each shop's own phone number.

How quickly will someone get back to me?

Call the shop nearest you, or send a message, and we will get back to you the same business day.

Do you have a program for fleets?

Yes. Our Fleet Maintenance Partnership Program includes scheduled PM service, on-site inspections and repair, and priority support when service is needed. Ask any of our shops about it.

Still have a question?

Statesville: 704-960-8951. Bessemer City: 980-391-4100. Monroe: 980-396-6750. Or email marketing@gallaherfleetsolutions.com or request service at www.gallaherfleetsolutions.com/contact. See Fleet Services for everything we do.