2024 Peterbilt 579 Spark Plug Type & Gap
Everything you need to know about spark plugs for your 2024 Peterbilt 579 (spoiler: it doesn't have them!).
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Quick reference
| Engine | OEM Plug PN | Aftermarket (NGK/Denso/Motorcraft) | Gap (in/mm) | Torque (lb-ft / Nm) | Interval |
|---|---|---|---|---|---|
| PACCAR MX-13 | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) |
| Cummins X15 | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) | N/A (Diesel) |
Why the right plug matters
Spark plugs are vital components in gasoline engines, igniting the air/fuel mixture to produce combustion. In the case of the 2024 Peterbilt 579, both available engine options, the PACCAR MX-13 and the Cummins X15, are diesel engines. Diesel engines operate on a different principle than gasoline engines; they rely on compression ignition rather than spark ignition. This means that diesel engines do not use spark plugs. Instead, they utilize glow plugs (primarily for cold starting) and injectors to deliver and ignite fuel.
Therefore, concerns about heat range, electrode metal (iridium vs. platinum vs. copper), and gapping procedures are not applicable to the 2024 Peterbilt 579.
How to gap a spark plug
This section is not applicable as the 2024 Peterbilt 579 uses diesel engines which do not have spark plugs.
Replacement procedure tips
This section is not applicable as the 2024 Peterbilt 579 uses diesel engines which do not have spark plugs.
Known issues
There are no known spark plug-related issues for the 2024 Peterbilt 579 as it is equipped exclusively with diesel engines that do not utilize spark plugs.
Need plugs replaced? Find a shop on Repairius.
More specs for the 2024 Peterbilt 579
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2024 Peterbilt 579 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-25.