Spark Plugs — Price Comparison

Spark Plugs for 2014 Ram 3500 HD

Spark plugs on a 2014 Ram 3500 HD are a wear item with a precise replacement interval, and using the right electrode material matters more than brand. Iridium and platinum plugs hold their gap for 60–100k miles; copper plugs spark marginally better but need replacement three times as often.

We compared 5 offers across major retailers for the 4th Gen platform (2009–2018 4th Gen). Prices range from $9.99 to $35.99 as of the last update.

Best picks

• Best overall: The iridium plug matching your engine's factory specification — same heat range, same gap, longest service life.
• Best budget: Copper-core plugs if you don't mind 20–30k mile intervals — they're cheap enough to replace often and conduct slightly better.

What to look for

• Never downgrade from factory iridium to copper on engines specced for long-life plugs.
• Buy the full cylinder count from one production lot — mixing plug states causes uneven running.
• Coil-on-plug engines: inspect the coil boots while you're in there; they're the usual failure companion.

Truck-specific note: cab configuration and bed length change part fitment more than model year does. A crew cab with the short bed and an extended cab with the long bed are effectively different vehicles to parts catalogs — have your exact configuration handy when ordering.

Fitment note

Verified for 2014 Ram 3500 HD (4th Gen). Fits 2009–2018 4th Gen generation unless trim-specific exclusions apply. Confirm trim and option codes before ordering.

Prices are affiliate-linked estimates. Confirm current pricing at the merchant before purchase.