Quick reference

Mileage	Service	Notes
5,000 mi	Inspection sweep	Heavy-duty tractors don’t use passenger-car 5k service. Do a quick check: engine oil level/condition, coolant level, DEF level, visible leaks, tire wear/pressure, lights, wiper blades. Drain air tanks daily; check air dryer purge. No tire “rotation” on Class 8 (steer vs drive positions differ).
10,000 mi	Chassis and safety checks	Inspect belts/hoses, charge-air boots, battery connections, brake lining thickness, slack adjusters, fifth wheel lube/lock, driveline U-joints/play. Pull fault codes (aftertreatment). Lubricate chassis per lube chart.
15,000 mi	Fuel filters; cabin air filter; air filter check	Replace primary/secondary fuel filters typically every 15k–30k miles (shorter if low fuel quality or frequent idling). Replace/inspect HVAC cabin filter every 15k–30k or 12 months. Check engine air filter by restriction gauge; replace only if indicated.
30,000 mi	Engine oil and filters (as applicable); fuel filters; aftertreatment check	Factory oil drain depends on engine, oil spec, and duty cycle: A26 and Cummins X15 often 25k–60k+ miles or 600–1,000 hours under normal long-haul. Severe duty can be 15k–25k. Confirm with engine manual or oil analysis. Replace fuel filters if not yet done. Inspect DEF system lines/doser for crystals; verify forced regen availability.
60,000 mi	Air filter (as needed); accessory belt; coolant test; driveline lube	Replace engine air filter if restriction indicates or dusty service (typ. 50k–100k). Inspect/replace accessory drive belt and tensioner if cracking/noise (typ. 60k–120k or 2–4 yrs). Test coolant freeze point and nitrite/moly levels as applicable (ELC OAT often “no additive” but test annually). Lube driveshaft slip yokes/U-joints.
100,000 mi	CCV filter; air dryer service; alignment and suspension check	Replace crankcase ventilation (CCV) filter typically 100k–150k. Service air dryer desiccant cartridge annually or ~100k–150k depending on humidity and purge performance. Check kingpins, bushings, shocks, ride height valve; set front-end alignment if irregular wear.
150,000 mi	Transmission/differentials check; coolant service (if due); belt set; comprehensive inspection	Transmission fluid service varies widely: Eaton Endurant/Fuller AMT/manual often 150k–300k+ on synthetic; Allison automatic up to 150k–300k+ per TES-668. Differentials typically 250k–500k on synthetic—inspect level/leaks now, plan service. Coolant: Extended-life (ELC) commonly 300k/5 yrs—test now; flush if contaminated or per engine OEM. Replace accessory belt/tensioner if not yet done; replace cabin and engine air filters if near end of life.

Notes on items often asked about for the LT:

Spark plugs: Not applicable (diesel engines).
Timing belt/chain: Heavy-duty diesels use gear-driven camshafts; no belt to replace. Inspect front cover area for leaks during routine service.
Brake fluid flush: Not applicable to air brake systems. Maintain and test air system; service air dryer and drain tanks regularly.
Transfer case/tire rotation: No transfer case on highway 4x2/6x4 tractors; tire rotation is not routine—manage by axle position and wear patterns.

When in doubt on interval ranges above, follow the specific engine/transmission manufacturer’s recommendations in your owner’s/maintenance manual.

Severe-duty schedule

Applies if you operate in heavy city stop-and-go, high idle/PTO time, frequent short trips, dusty/off-highway, extreme cold/heat, or heavy GCW/hilly terrain.

Engine oil and filters: 15k–25k miles or 400–600 hours. Use oil analysis to dial in. Consider higher-soot formulations and CJ-4/CK-4 or FA-4 as approved by your engine.
Fuel filters: 10k–15k miles; drain water separators frequently.
Engine air filter: Inspect at every 10k; replace when restriction indicates—often 30k–60k in dust.
CCV filter: 75k–100k.
Air dryer desiccant: Every 12 months regardless of miles; verify purge and check for wet tank moisture.
Coolant: Test every 30k/annual; flush earlier if degradation or contamination is found.
Transmission/differentials: Consider servicing at the early end of the OEM window (e.g., 150k–200k for AMT/auto; 250k–300k diffs) if frequent hill pulls, high GCW, or high temps.

Known issues by mileage (2022 International LT generation)

These are commonly reported maintenance watch-items in fleet service for late-model LT tractors with A26 or Cummins X15 power. Always verify with current TSBs and your VIN service history.

0–50k miles: Excessive idle leading to frequent DPF regens; keep idle time low and ensure software calibrations are current. Watch for charge-air cooler boot loosening and early belt/tensioner noise. Inspect wiring harness routing for chafe near frame rails and DEF tank area.
50k–100k miles: EGR valve/cooler soot accumulation causing efficiency drop or coolant seep—look for gradual coolant loss and perform leak/pressure tests. HVAC blend door actuator and blower resistor intermittents have been noted—check cabin filter condition and debris. Wheel-end seals may sweat—monitor.
100k–150k miles: NOx sensors and DEF doser crystalization are common across modern aftertreatment—ensure quality DEF and periodic inspections. Turbo actuator response faults may arise; inspect linkages and perform VGT sweeps. Air dryer performance drop shows as moisture in tanks—service desiccant. Suspension bushings/height valves may begin to wear—inspect at 100k+.

If you experience MIL or derate events, perform a smoke/leak test of charge-air, confirm regens, and check for latest ECM calibrations.

Estimated cost per service (parts + labor)

Engine oil and filters: $300–$600 (11–12 gal CK-4/FA-4 + primary/secondary oil filters; varies by engine).
Fuel filter set: $150–$300.
Engine air filter: $80–$200.
Cabin/HVAC filter: $30–$80.
CCV (crankcase) filter: $150–$250.
Air dryer desiccant/service: $200–$350.
Coolant test/flush: Test $40–$80; full ELC drain/fill $250–$500 depending on capacity.
Transmission fluid service: $400–$900 (Eaton/Allison; synthetic ATF/MTF and filters as applicable).
Differential gear oil service: $300–$700 per axle on synthetic.
Accessory belt and tensioner: $150–$300.

Labor rates for heavy-truck shops vary by market; expect $140–$200/hr. Ask for OEM-approved fluids (ELC coolant, synthetic gear oil, TES-668 where applicable) and keep receipts to maintain warranty.

What you can DIY vs shop

DIY-friendly (with proper safety and PPE):

Cabin air filter replacement; engine air filter if access allows.
Fuel filter changes on the frame/head (prime per OEM procedure to avoid hard-start).
Accessory belt replacement and visual hose/belt inspections.
Chassis grease on accessible zerks, fifth wheel lube, battery terminal service.

Best left to a qualified shop:

Engine oil service on high-capacity systems without proper waste handling; overhead/valve adjustments; ECM calibrations.
Aftertreatment diagnostics, forced regens, DPF cleaning, NOx/DEF system testing.
Transmission and differential services (fill specs, level procedures, and torque critical).
Air system service and leak diagnosis; brake chamber/slack adjuster work.
Cooling system flush with vacuum-fill to prevent air pockets.

Always confirm intervals in your specific manuals: International LT chassis plus your engine (International A26 or Cummins X15), transmission (Eaton/Allison), and axle manufacturers provide the governing maintenance schedules. Oil analysis is strongly recommended to set oil drain intervals for your route and idle profile.

Book service on Repairius.

2022 International LT — Factory Maintenance Schedule

Quick reference

Severe-duty schedule

Known issues by mileage (2022 International LT generation)

Estimated cost per service (parts + labor)

What you can DIY vs shop

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