The Dodge Durango SUV and Chrysler 300 sedan share powertrains with the broader Stellantis (formerly FCA) lineup. Here's the right plug for each engine option.
3.6L Pentastar V6 (Both Models)
The 3.6L Pentastar powers the base Durango and most Chrysler 300 trims. NGK Iridium IX or Champion Iridium are both proven choices for this engine. The Pentastar is known for smooth, reliable operation — keep it that way with quality iridium plugs at 60,000-mile intervals.
5.7L HEMI V8
The 5.7L HEMI in the Durango R/T and Chrysler 300C uses 16 spark plugs — two per cylinder. Champion Iridium is the preferred OEM-style choice for HEMI applications. Replace all 16 at once for balanced combustion across all cylinders.
6.4L 392 HEMI (Durango SRT)
The 475 hp 392 HEMI in the Durango SRT deserves nothing but premium iridium. Champion Iridium or NGK Iridium IX handle the elevated performance demands. Inspect at 30,000–40,000 miles given the high-output nature of this engine.
Chrysler 300 SRT (6.4L)
Same plug recommendation as the Durango SRT. Champion Iridium is the correct specification for the 6.4L in performance Chrysler applications.
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