Best Spark Plugs for Jeep Grand Cherokee: All Engines Covered

The Jeep Grand Cherokee is one of the most capable and versatile SUVs on the market. From the efficient 3.6L Pentastar to the thunderous 6.4L HEMI, each engine has specific spark plug needs.

3.6L Pentastar V6

The base Pentastar engine is found in the majority of Grand Cherokee models. NGK Iridium IX or Champion Iridium plugs are both excellent choices. The 3.6L responds well to quality iridium, delivering smooth idle and crisp throttle response. Service interval: 60,000 miles.

5.7L HEMI V8

The 5.7L HEMI is a beloved engine in the Grand Cherokee lineup. Remember — it uses two plugs per cylinder, totaling 16 plugs. Champion Iridium is the OEM-preferred choice for HEMI applications. Replace all 16 at once to keep combustion balanced across all cylinders.

6.4L 392 HEMI (SRT and Trackhawk)

The high-output 392 HEMI demands premium iridium plugs. Champion Iridium or NGK Iridium IX handle the elevated cylinder pressures and temperatures of this performance engine. Service interval: 30,000–40,000 miles given the high-output nature.

3.0L EcoDiesel

The EcoDiesel Grand Cherokee uses glow plugs rather than spark plugs — a separate maintenance item. Inspect them every 60,000 miles for reliable cold-weather diesel ignition.

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