A Class 8 PM service interval chart sorts maintenance into A, B and C services so every truck gets the right work at the right time. The catch is that the tiers have no standard numbers: sources use the same names with very different intervals. This page lays out what each tier should include and where the published figures disagree. Schedule a call to build your PM chart.
Class 8 PM Service Interval Chart: A, B and C Services by Miles, Hours and Calendar Limit
The names are shared, but the intervals behind them are not, so compare sources before copying a chart
Neither FleetRabbit's article nor the vendor sources we read publish a standard set of tier intervals. FleetRabbit's tier article uses 25,000, 50,000 and 100,000 miles as an illustration and says each tier needs a mileage trigger, an hours trigger and a calendar limit, with the first one reached governing. A vendor chart from OxMaint gives lower numbers, and its OEM table is unsourced. Your engine and axle manuals decide the real figures.
| Source | A | B | C | How to read it |
|---|---|---|---|---|
| Generic vendor chart (OxMaint) | 10,000-15,000 mi | 25,000-30,000 mi | 50,000-60,000 mi, annually | Vendor content, no sources for the intervals |
| Same vendor, OEM baseline: Peterbilt, Kenworth | 12,500 | 25,000 | 50,000 | Unsourced table, verify in your manual |
| Same vendor: International, Mack, Freightliner | 15,000 | 30,000 | 60,000 | Same caveat |
| Same vendor: Volvo | 20,000 | 40,000 | 60,000 | Same caveat |
| FleetRabbit worked example | 25,000 | 50,000 | 100,000 | Illustration only, not a standard |
What Each Class 8 PM A, B and C Service Should Include: Tasks by Tier
Tiers nest, so a C service carries every A and B task and resets all three clocks
| Task | First appears at |
|---|---|
| Engine oil and filter, fluids, tire check, lights, brake visual, fault codes | A |
| Fuel and air filters, brake measurement, steering, suspension, battery and coolant tests, belts and hoses | B |
| Transmission and differential fluid, wheel ends, chassis lubrication, coolant and brake fluid service, annual inspection items | C |
The task split is the author's own assessment in both FleetRabbit's and OxMaint's articles, not a manufacturer standard. Under 49 CFR 396.17 each vehicle needs a passing periodic inspection within the preceding 12 months, and OxMaint suggests scheduling the annual C service at 11 months to leave a buffer.
Oil and Filter Intervals for Class 8 Diesel Engines: Why One Number Does Not Exist Even for the Cummins X15
Fuel economy, idle time and the engine's model year all move the drain interval
The sources disagree even on one engine. One FleetRabbit article cites the Cummins 2024 guide with oil drains of 25,000 to 75,000 miles by fuel economy band, while another FleetRabbit article lists 60,000 miles for light duty, and Fleet Equipment quotes 35,000 miles for the X15 at 5.5 to 6.5 mpg. Idle or PTO above 40 percent moves a unit to the next lower tier in the Cummins guide, as FleetRabbit reports it, and a 12 month cap applies.
| Source | Oil drain figure | Condition |
|---|---|---|
| Cummins guide, EPA 2024, via FleetRabbit | 25,000 to 75,000 mi | By fuel economy band, 12 month cap |
| Same article, EPA 2017 guide | 25,000 / 35,000 / 50,000 mi | Severe, normal, light |
| Same article, EPA 2013 guide | 20,000 / 30,000 / 40,000 mi | Severe, normal, light |
| FleetRabbit PM tier article, X15 quick reference | 25,000 to 60,000 mi | Severe vs light; conflicts with the 75,000 above |
| Fleet Equipment article, undated | X15: 35,000 mi at 5.5-6.5 mpg; Volvo D11/D13: 60,000 mi | OEM recommendation as quoted |
Extended drains exist: the same article says Valvoline and Cummins announced up to 100,000 miles for 2021 to 2026 X15 engines on a specific oil. Use that only with the exact oil, engine serial number and the engine maker's current guide. Oil analysis helps you decide, since Fleet Equipment calls it the best indicator of oil condition and says it tracks fuel dilution, soot, coolant and wear metals.
Miles, Hours or Months: How the First-Limit-Reached Rule Decides When a Class 8 Truck Comes Due
Idle-heavy and short-haul trucks hit the hours limit long before the mileage limit
FleetRabbit's article converts a 500 hour limit at an assumed average speed. The table repeats that arithmetic, and the regional row is our own addition. The same article also shows a 40 tractor example at 110,000 miles each, which it totals at about 704 bay hours a year by adding every tier separately. If a C visit replaces A and B, the same illustrative numbers work out to roughly 460 hours, so check how your planning tool counts nested tiers.
| Duty profile | 500 engine hours equals | Which limit hits first |
|---|---|---|
| Highway, about 55 mph average | About 27,500 miles | Usually miles |
| Regional, about 40 mph average | About 20,000 miles | Miles or hours |
| Stop and go, about 22 mph average | About 11,000 miles | Hours |
Brakes, Driveline and Filters: Where the Class 8 PM Chart Has No Published Number and What to Do Instead
Condition-based triggers and the engine and axle manuals fill the gaps
None of the sources we read gives a mileage interval for brake relines, transmission or differential service. They place brake measurement at B and driveline fluids at C and leave the numbers to the maker. Penske says its technicians change filters at PM according to meter readings or day intervals, and sooner when signs show, with air filters watched on a restriction indicator and cabin filters checked at every PM. The TMC Recommended Practices Manual 2026 to 2027, about 3,700 pages, includes chassis and brake inspection practices if you want a reference beyond a vendor chart.
How to Build Your Own Class 8 PM Chart in Five Steps: From Engine Manual to Nested A, B and C Rules
Build it per engine group, because a single fleet-wide number will be wrong for someone
How FleetRabbit Handles Class 8 PM A, B and C Scheduling, Templates and Work Orders
The tiers live in one schedule, and a failed inspection item can open a work order
FleetRabbit's tier article describes PM scheduling by mileage, hours and calendar per model, standard templates per tier and model family with version control, parts and labor tracking per tier, photo and due date recording for deferred work and a 90 day PM board for bay capacity. It also describes work orders created from failed inspection items. It supplies no tier intervals of its own, so the numbers come from your manuals. Confirm in a demo how nested tiers reset after a C visit.
