2026 Ram 3500 Maintenance Schedule
Complete Service Intervals for 6.4L HEMI V8 & 6.7L Cummins Turbo Diesel (Standard & HO)
Proudly serving Brevard, Asheville, Hendersonville, Fletcher & Cherokee NC
Ram 3500 Scheduled Maintenance Overview
The Ram 3500 is built for the heaviest workload — with a 36,610 lb gooseneck tow rating on Cummins HO configurations. Engines mirror the 2500 (6.4L HEMI V8 and 6.7L Cummins SO/HO), but the 3500 sees heavier use, more towing, more time loaded, and longer durations of severe-duty operation. Service intervals get even more important on the 3500.
Ram 3500 uses the Stellantis Oil Change Indicator System on HEMI; Cummins uses its own oil-life algorithm. Heavy fifth-wheel and gooseneck operation almost always triggers severe-duty intervals. Cummins oil should not exceed 7,500 miles under severe duty regardless of indicator.
Oil & Filter
HEMI: every OLM
Cummins: 7,500 mi (severe)
Tire Rotation (Dually)
Every 6,000 mi
(SRW & DRW both)
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 (DRW: rotate side-to-side) • Multi-point inspection • Inspect brake pads, rotors & hoses • Inspect transmission fluid level • Inspect transfer case & 4WD • Inspect cooling system • (Cummins) Drain water separator • Top off DEF • Inspect 5th-wheel/gooseneck hitch (if equipped) • (Cummins) Inspect exhaust brake |
| 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 (Severe / Heavy Tow) | All of the above + Change transfer case fluid (severe) • Change front & rear differential fluid (severe / heavy tow) • Change automatic transmission fluid (severe / heavy tow) |
| 100,000 Miles | All of the above + Replace spark plugs (HEMI) • (Cummins) Crankcase ventilation filter service • Inspect accessory drive belt |
| 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 HD heavy-tow use. Coolant: Mopar OAT (HEMI); Cummins yellow OAT (diesel). Cummins DEF: Topped off at every service.
Engine-Specific Maintenance Details
The 2026 Ram 3500 offers gas HEMI V8 or Cummins Turbo Diesel I-6 in standard or high-output. The HO Cummins makes 1,075 lb-ft and pairs with the Aisin 6-speed transmission for max-tow configurations.
| Specification | 6.4L HEMI V8 (Gas) | 6.7L Cummins Diesel (Standard) | 6.7L Cummins Diesel (HO) |
|---|---|---|---|
| Oil Type | SAE 0W-40 Full Synthetic | SAE 15W-40 CES 20081 (or 5W-40 synthetic) | SAE 15W-40 CES 20081 (or 5W-40 synthetic) |
| 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 |
| Spark Plug / Glow Plug Interval | 100,000 miles | Per service manual | Per service manual |
| Transmission Fluid | Mopar 8-Speed ATF | Mopar HD ATF | Aisin 6-Speed ATF (HO required) |
| Additional Notes | 410 hp / 429 lb-ft; max tow 16,870 lbs | 370 hp / 850 lb-ft; DEF required | 430 hp / 1,075 lb-ft; max tow 36,610 lbs gooseneck |
Heavy-Duty Towing, Dually & Cummins HO Maintenance
Ram 3500 single rear wheel (SRW) and dually rear wheel (DRW) configurations see the heaviest workload in the lineup. Towing campers, equipment trailers, and fifth-wheel rigs at or near max capacity is severe-duty operation — the schedule becomes the floor, not the target.
- DRW (dual rear wheel / dually) tires need side-to-side rotation, not front-to-back — inspect inner duals which are easy to overlook.
- 5th-wheel and gooseneck hitch service — inspect rails, brackets, and gooseneck ball at every service.
- Max-tow Cummins HO use: oil at 7,500 mi, transmission fluid at 30,000-60,000 mi.
- Aisin 6-speed transmission (HO Cummins) has its own service requirements and fluid spec — follow service manual.
- DEF tank larger on HD trucks — still typically 10,000-15,000 miles between refills.
- Cummins exhaust brake is essential for safe descent of fifth-wheel and gooseneck loads on Western NC grades.
- Heavy fleet duty: 2-year brake fluid interval; consider 5,000-7,500 mi oil intervals.
- Loaded payload routinely 6,000+ lbs in bed accelerates rear suspension wear — inspect.
Severe & Special Operating Conditions
Cummins defines severe operating conditions as any of the items below. Ram 3500 owners almost universally fall into severe-duty.
- Towing 20,000+ lbs (fifth-wheel and gooseneck)
- Heavy payload (6,000+ lbs in bed routinely)
- Extended idling (jobsite, trailer queues, loading docks)
- Operating in dusty or sandy conditions
- Sustained mountain grade driving (Western NC)
- Frequent short trips that prevent engine warm-up
- Extreme cold weather (below 0°F) or extreme heat (above 100°F)
- Jobsite duty or commercial fleet operation
Service for Ram 3500 Owners Across Western NC
Ram 3500 owners across Western NC use these heavy-duty trucks for the toughest work — hauling fifth-wheel RVs to Asheville and Hendersonville campgrounds, towing equipment trailers around Brevard and Fletcher, and running construction or agricultural fleet operations across the region (including Cherokee NC). Mountain descents with 30,000+ lbs behind you require the Cummins exhaust brake. Cold winter Cummins starts demand proper procedure. Our Mopar-certified diesel technicians handle every Ram 3500 duty.
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 3500.
- Tire pressure — check before every loaded run; DRW inner duals are easy to neglect.
- Engine oil level — check every fuel fill-up for Cummins.
- Coolant level — verify weekly under heavy duty.
- DEF level — check at every fuel fill-up.
- Brake fluid level — check weekly under heavy tow.
- Trailer hitch / 5th-wheel rails — inspect at every tow trip.
- Fuel water separator — drain at every fill-up.
- Visual underbody check — fluid leaks, exhaust damage, hitch wear after every heavy work day.
Note on Pricing: Ram 3500 service pricing reflects HD use. HEMI vs Cummins SO vs Cummins HO each have distinct pricing. Aisin 6-speed service is higher than standard 8-speed. Fleet operators may qualify for BusinessLink fleet programs. Call (828) 492-2121 for specific quotes.
Schedule Your Ram 3500 Maintenance at Mahon CDJR
Mahon CDJR is your authorized Ram service center for the HD 3500. Our Mopar-certified diesel technicians handle the 1,075 lb-ft Cummins HO, the Aisin 6-speed, and every other HD service. Schedule online or call our service team.
Created June 22, 2026 by MM Dealer Advocates