2026 Ram Chassis Cab Maintenance Schedule
Complete Service Intervals for 3500/4500/5500 HEMI & Cummins Diesel Commercial Powertrains
Proudly serving Brevard, Asheville, Hendersonville, Fletcher & Cherokee NC
Ram Chassis Cab Scheduled Maintenance Overview
The Ram Chassis Cab (3500, 4500, 5500) is the commercial workhorse — designed for upfitting with service bodies, dumps, contractor beds, tow rigs, and more. Class 3, 4, and 5 commercial duty cycles demand strict adherence to the maintenance schedule. Stellantis BusinessLink fleet programs help offset cost and minimize downtime.
Ram Chassis Cab uses the Stellantis Oil Change Indicator System on HEMI; Cummins uses its own oil-life algorithm. Commercial duty almost always means severe-duty intervals. Cummins oil should not exceed 7,500 miles under commercial duty regardless of indicator. Fleet operators benefit from preventive maintenance contracts.
Oil & Filter
HEMI: every OLM
Cummins: 5,000-7,500 mi (commercial)
Tire Rotation
Every 6,000 mi
(LT/Commercial tires)
Fuel/Water Separator
Cummins: every 15,000 mi
DEF (Cummins)
Topped off at every service
Complete Maintenance Schedule by Mileage
| Mileage Interval | Services Performed |
|---|---|
| Every Oil Change | Change engine oil & filter • Rotate tires & inspect tread • Multi-point inspection • Inspect brake pads, rotors & hoses • Inspect transmission fluid level • Inspect transfer case & 4WD (if equipped) • Inspect cooling system • (Cummins) Drain water separator • Top off DEF • Inspect upfit body mounting & PTO (if equipped) • Inspect electrical for upfit equipment |
| 15,000 Miles (Cummins) | All of the above + Replace fuel filter and water separator (Cummins) |
| 30,000 Miles | All of the above + Replace cabin and engine air filter • Inspect axle vent tubes |
| 60,000 Miles (Commercial / Severe) | All of the above + Change transfer case fluid (severe) • Change front & rear differential fluid (commercial / severe) • Change automatic transmission fluid (commercial) |
| 100,000 Miles | All of the above + Replace spark plugs (HEMI) • (Cummins) Crankcase ventilation filter service • Inspect accessory drive belt • Inspect upfit hardware for fatigue |
| 150,000 Miles | All of the above + Change automatic transmission fluid (normal) • Change all driveline fluids (normal) • (Cummins) DEF system inspection |
| Engine Coolant | HEMI: Mopar OAT (orange). Cummins: yellow OAT — follow Cummins schedule. |
Time-Based Service
Brake fluid: Replace every 2 years for commercial use. Coolant: Mopar OAT (HEMI); Cummins yellow OAT (diesel). Cummins DEF: Topped off at every service.
Engine-Specific Maintenance Details
Ram Chassis Cab is offered in 3500, 4500, and 5500 configurations. Engines are 6.4L HEMI V8 (3500) and 6.7L Cummins Turbo Diesel I-6 (3500/4500/5500). HO Cummins is widely available for max payload and tow.
| Specification | 6.4L HEMI V8 (3500 CC) | 6.7L Cummins Diesel (Standard) | 6.7L Cummins Diesel (HO) |
|---|---|---|---|
| Oil Type | SAE 0W-40 Full Synthetic | SAE 15W-40 CES 20081 | SAE 15W-40 CES 20081 |
| Oil Capacity | 7.0 qt (with filter) | 12.0 qt (with filter) | 12.0 qt (with filter) |
| Oil Filter | Mopar MO-491 | Cummins LF16035 (Fleetguard) | Cummins LF16035 (Fleetguard) |
| Spark Plugs / Glow Plugs | Mopar SPLZAR14LR-13 (x16) | Glow plugs per service book | Glow plugs per service book |
| Transmission Fluid | Mopar 8-Speed ATF | Mopar HD ATF | Aisin 6-Speed ATF |
| Available Configurations | 3500 CC only | 3500 / 4500 / 5500 CC | 3500 / 4500 / 5500 CC |
| Additional Notes | 410 hp / 429 lb-ft | 370 hp / 850 lb-ft; DEF required | 430 hp / 1,075 lb-ft; DEF required |
Commercial Fleet, Upfit & Class 3-5 Maintenance
Chassis Cab trucks are commercial vehicles — typically upfit with service bodies, dump beds, flatbeds, contractor beds, wrecker rigs, or vocational equipment. Commercial duty cycles plus upfit hardware require specific maintenance attention beyond the standard truck schedule.
- Upfit hardware (service bodies, dumps, PTOs, hydraulics) requires periodic inspection at every service.
- Power take-off (PTO) systems on upfit hydraulics have their own maintenance schedule — ask your upfitter.
- Commercial duty: 5,000-7,500 mi oil intervals; 2-year brake fluid; 30,000-60,000 mi transmission fluid.
- Stellantis BusinessLink fleet programs offer priority service scheduling and discounted preventive maintenance.
- DEF and fuel filter service is a recurring fleet operating cost — budget accordingly.
- Class 3-5 brake systems wear faster than light-duty — inspect every oil change.
- Upfit electrical loads benefit from auxiliary battery and alternator inspection.
- DOT-required CDL inspections augment but do not replace the manufacturer’s maintenance schedule.
Severe & Special Operating Conditions
Stellantis and Cummins define commercial operating conditions as severe by definition. Chassis Cab severe-duty includes any of the below.
- Commercial duty cycle (most Chassis Cab use)
- Heavy payload (varies by class; typical 8,000-15,000 lbs)
- Heavy towing (varies by class)
- Extended idling (jobsite, PTO operation)
- Operating in dusty or jobsite conditions
- Sustained mountain grade driving (Western NC commercial)
- Extreme cold weather (below 0°F) or extreme heat (above 100°F)
- Frequent short trips between job sites
Service for Ram Chassis Cab Owners Across Western NC
Ram Chassis Cab fleets across Western NC handle construction, agriculture, utility service, and commercial operations — around Brevard, in Asheville, throughout Hendersonville, Fletcher, and Cherokee NC. Upfit service bodies, dumps, and contractor beds on the 3500/4500/5500 see heavy daily use. Mountain grades stress brakes (Cummins exhaust brake helps). Cold winter starts stress diesel powertrain. Our BusinessLink-affiliated Mopar-certified team understands commercial fleet needs.
Monthly & Semi-Annual Owner Checks
Between scheduled service visits, a few quick owner checks help catch problems before they become repairs. These take only a couple of minutes and apply to every Ram Chassis Cab.
- Tire pressure — check before every loaded run; check inner duals on DRW.
- Engine oil level — check at every fuel fill-up for commercial Cummins use.
- Coolant level — verify weekly.
- DEF level — check at every fill-up.
- Brake fluid level — check weekly under heavy commercial duty.
- Upfit body mounting bolts — inspect monthly; commercial vibration loosens hardware.
- Fuel water separator — drain at every fill-up.
- Hydraulic / PTO equipment — inspect per upfit manufacturer’s schedule.
Note on Pricing: Chassis Cab service pricing reflects commercial duty. Fleet operators should explore BusinessLink preventive maintenance contracts which lower per-service cost. Upfit hardware service may be separate from the chassis manufacturer’s schedule. Call (828) 492-2121 for fleet quotes.
Schedule Your Ram Chassis Cab Maintenance at Mahon CDJR
Mahon CDJR is a BusinessLink-affiliated Ram dealer with Mopar-certified diesel technicians for the full Chassis Cab lineup (3500/4500/5500). Our team understands commercial fleet needs and offers scheduling that minimizes downtime. Call our service team for fleet programs.
Created June 22, 2026 by MM Dealer Advocates