2018 GMC Sierra 1500 Spark Plug Type & Gap
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick reference
| Engine | OEM Plug PN (ACDelco) | Aftermarket (NGK/Denso) | Gap (in/mm) | Torque (lb-ft / Nm) | Interval (miles/km) |
|---|---|---|---|---|---|
| 4.3L LV3 V6 | 41-162 | NGK SILR6A7S (91139) | 0.040 / 1.02 | 11 / 15 | 97,500 / 157,000 |
| 5.3L L83 V8 | 41-162 | NGK SILR6A7S (91139) | 0.040 / 1.02 | 11 / 15 | 97,500 / 157,000 |
| 6.2L L86 V8 | 41-162 | NGK SILR6A7S (91139) | 0.040 / 1.02 | 11 / 15 | 97,500 / 157,000 |
Note: Motorcraft does not produce spark plugs for GMC vehicles.
Why the right plug matters
Choosing the correct spark plug for your 2018 GMC Sierra 1500 is crucial for optimal engine performance, fuel efficiency, and longevity. The
More specs for the 2018 GMC Sierra 1500
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
2018 GMC Sierra 1500 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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