Whether you're driving a Charger R/T or a Challenger Scat Pack, your Mopar engine needs the right spark plugs to deliver the power and efficiency you paid for. Let's break down the best options for each engine.
3.6L Pentastar V6
The base 3.6L Pentastar is a smooth, efficient engine that responds well to NGK Iridium IX plugs. They improve fuel efficiency and throttle response noticeably compared to worn factory plugs.
5.7L HEMI V8
The 5.7L HEMI is an icon. It runs best with Champion Iridium or NGK Iridium IX plugs. The HEMI uses two plugs per cylinder (16 total on the V8) — that's double the replacement cost, so going iridium for the longer service interval makes financial sense.
6.4L 392 HEMI
For the performance 392, stick with premium iridium from NGK or Champion. The high-compression engine demands plugs with excellent heat range management to prevent pre-ignition.
When to Replace HEMI Plugs
Dodge recommends 30,000 miles for standard plugs on the HEMI. However, if you upgrade to iridium, you can stretch that to 60,000 miles. Given how long the job takes (especially on the 5.7 where rear plugs are tight), longer intervals are a real benefit.
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