The Kenworth T680 runs a PACCAR MX-13 in most fleets, and PACCAR service intervals depend on idle time and duty, not only miles. This page gives a PM-A, PM-B and PM-C framework at 12,500, 25,000 and 50,000 miles, the MX-13 component intervals by duty profile, and the points where published figures conflict. Schedule a call to set up your T680 PM program.
KENWORTH T680 · PACCAR MX-13 · FLEET PM PROGRAM
Three PM Tiers and One Duty Profile Cover Most of a T680's Service Life
PM-A, PM-B and PM-C checklists, MX-13 intervals by idle share, and a setup path that keeps every service on record.
T680 PM TIERS
PM-A12,500 mi
PM-B25,000 mi
PM-C50,000 mi
Fleet-software baseline for PACCAR trucks.
The T680 PM Framework: PM-A, PM-B and PM-C
A fleet-software guide lists 12,500, 25,000 and 50,000 miles as the PACCAR baseline
The most useful starting grid for a Kenworth or Peterbilt is a PM-A every 12,500 miles, a PM-B every 25,000 and a PM-C every 50,000. Each tier includes the one before it. This baseline comes from a fleet-software guide and not from a PACCAR document, so confirm it against your owner's manual and warranty terms.
| Tier | Interval | What it covers |
|---|---|---|
| PM-A | Every 12,500 mi | Oil and filter, brake inspection, tires, lights and safety gear, fluid top-offs |
| PM-B | Every 25,000 mi | Everything in A plus fuel filter, belts and hoses, U-joints and slip yoke, steering, expanded brake service |
| PM-C | Every 50,000 mi | Everything in A and B plus transmission and differential fluids, coolant and brake fluid, alignment check, annual DOT inspection |
Baseline, not mandate. The source says to verify intervals against the truck's build sheet. The MX-13 engine intervals below are longer than the 12,500-mile PM-A, which is why many fleets pair oil on a longer clock with shorter inspection visits.
MX-13 Service Intervals by Duty Profile
Oil changes run from 25,000 to 75,000 miles depending on idle time and severity
Two vendor guides agree on the oil interval by profile: up to 75,000 miles or 2,250 hours for linehaul with under 20 percent idle, 50,000 miles or 1,500 hours with more idle, and 25,000 to 30,000 miles for severe or vocational work. The oil must meet CK-4, and biodiesel blend and gross weight also affect the interval.
MX-13 ENGINE OIL AND FILTER INTERVAL BY DUTY PROFILE, MILES. TWO VENDOR GUIDES
Linehaul, under 20% idle
75,000 mi
Linehaul, 20% idle or more
50,000 mi
Severe or vocational
25,000 - 30,000 mi
0k
20k
40k
60k
80k
The two guides disagree on filters and aftertreatment, so the table shows both ranges
Fuel filter, DPF and DEF filter figures differ between the two guides. For example, one gives a 50,000-mile fuel filter interval for low-idle linehaul and the other 75,000. Neither names the PACCAR document it came from, so use the shorter figure until your manual says otherwise.
| Item | Under 20% idle | 20% idle or more | Severe or vocational |
|---|---|---|---|
| Engine oil and filter (CK-4) | 75,000 mi / 2,250 hr | 50,000 mi / 1,500 hr | 25,000 - 30,000 mi |
| Fuel filter | 50,000 - 75,000 mi | 40,000 - 50,000 mi | 25,000 - 30,000 mi |
| DPF cleaning | 200,000 - 300,000 mi | 150,000 - 300,000 mi | 125,000 - 150,000 mi |
| DEF filter | 200,000 - 300,000 mi | 150,000 - 300,000 mi | 100,000 - 300,000 mi |
| Valve adjustment | 150,000 - 200,000 mi | 150,000 mi | 60,000 - 100,000 mi |
| TX-12 / TX-18 oil | 500,000 mi or more | 400,000 mi or more | 250,000 mi |
MX-11 is not covered. None of the sources found gave MX-11 intervals, so look them up in the MX-11 service documentation before applying these figures.
Mixing linehaul and vocational T680s? Schedule a call and we will set a template per duty profile.
One PM template per profile, assigned to each truck by idle share.
T680 PM-A, PM-B and PM-C Checklists
Tick each item as the technician completes it, and carry A items into every later visit
A
PM-A: Basic Safety Service
Baseline: every 12,500 miles
Engine oil and filter change
Brake inspection
Tire pressure and tread
Lights and safety equipment
Fluid top-offs
DEF level
Check for leaks
Chassis lubrication
B
PM-B: Intermediate Service
Baseline: every 25,000 miles. Includes every PM-A item.
Fuel filter replacement
Belt and hose inspection
Driveline and U-joint check
Slip yoke check
Steering component inspection
Expanded brake service
Battery and charging test
Aftertreatment fault check
C
PM-C: Comprehensive Service
Baseline: every 50,000 miles or yearly. Includes PM-A and PM-B.
Transmission fluid service
Differential fluid service
Coolant and brake fluid flush
Wheel alignment check
Annual DOT inspection
Full driveline and suspension review
Cab air filter replacement
Full diagnostic scan
One vendor guide notes the T680 cab air filter sits behind the glovebox panel, so allow for the access time.
Setting Up T680 PM in Software, Step by Step
Five steps take a T680 from a paper schedule to automatic reminders
1
Pick the MX engine
MX-13 intervals are published; check MX-11 in your manual
→
2
Set the duty profile
Idle share and severity decide the column
→
3
Load PM-A, B and C
12,500, 25,000 and 50,000 miles
→
4
Trigger by miles or hours
Whichever comes first
→
5
Log every service
Keep the record for warranty and resale
Keep OEM service on record
Date, miles and engine hours for every service
Oil and filter spec used
Technician and shop
Parts and invoices attached
Shorten the interval when
Idle time is above 20 percent
The truck runs vocational or heavy-haul
Loads are near the weight limit
Oil analysis shows early wear
Warranty terms were not covered by any source found, so check your own PACCAR warranty and dealer requirements. A complete service record with dates and specs is the best protection regardless.
Keep Every Kenworth T680 PM on Schedule: Automate PM-A, PM-B and PM-C by Miles or Hours in FleetRabbit
FleetRabbit lets you build PM-A, PM-B and PM-C templates, assign them to each T680 and trigger them by miles, engine hours or date. Reminders go out before a service is due, and each service is stored on the truck's record.
PM-A, B and C templates
Miles, hours or date triggers
Reminders before due
Service record per truck
Frequently Asked Questions
Quick answers on Kenworth T680 maintenance
How often does a Kenworth T680 need PM-A?
A fleet-software guide lists PM-A every 12,500 miles for Kenworth and Peterbilt, PM-B every 25,000 and PM-C every 50,000. Confirm against your manual.
How often does an MX-13 need an oil change?
Up to 75,000 miles or 2,250 hours for low-idle linehaul, 50,000 miles or 1,500 hours with more idle, and 25,000 to 30,000 miles for severe duty, according to two vendor guides.
What oil does the MX-13 use?
API CK-4, with 10W-30 preferred in one guide. Check your manual.
Are MX-11 intervals the same?
No source found gave MX-11 intervals, so check MX-11 documentation separately.
Why do the guides give different filter intervals?
Neither names a specific PACCAR document. Use the shorter figure until your manual confirms the longer one.
Does the T680 have any special service access?
One guide says the cab air filter is behind the glovebox panel with a Kenworth-specific part number.
What does FleetRabbit cost?
FleetRabbit is free for up to three vehicles and $5 per vehicle per month after that. Track 3 vehicles free.
Build a T680 PM Program That Runs Itself and Documents Every Service
Set the tiers once, let miles and hours trigger them and keep a clean record of each service for warranty, audits and resale.
Free tier for up to 3 vehicles · No credit card required · Service record stored per unit
October 12, 2026
By Alex Rowan
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