Automotive Replacement Spark Plugs

Consult your vehicle’s owner manual or manufacturer service spec for plug type, heat range, thread size, and gap; match those specs to the replacement product listing and filter by vehicle make/model/year when available

Common types are copper, platinum, double-platinum, and iridium; copper is inexpensive but wears faster, platinum and iridium offer longer life and better performance, while design differences affect longevity and ignition reliability

Premium plugs (platinum or iridium) generally last longer and can provide more consistent ignition over time, which may reduce maintenance frequency; whether they’re worth the extra cost depends on vehicle age, performance needs, and replacement interval preferences

Proper gap is critical for correct ignition; many replacement plugs come pre-gapped to common specs but always verify the gap against your vehicle’s specification and adjust carefully with a gap tool if necessary

Many owners can replace spark plugs with basic tools: a spark plug socket, ratchet, torque wrench, gap gauge, and anti-seize or dielectric grease if recommended; follow torque specs and proper sequence to avoid damage

Replacement intervals vary by plug type and vehicle: copper may need replacement around 20,000–30,000 miles, while many platinum/iridium plugs are rated for 60,000–120,000 miles; follow your vehicle manufacturer’s maintenance schedule

Common symptoms include rough idle, misfires, reduced fuel economy, difficulty starting, and a noticeable loss of power; diagnostic trouble codes and a visual inspection (carbon fouling, wear, or electrode damage) can confirm plug condition