Choosing the Right Spark Plugs for Your 2019-2024 Ram 1500 Classic
Keep your Ram's 5.7L Hemi or 3.6L Pentastar engine running strong with the correct spark plugs.
- The 5.7L Hemi V8 requires 16 spark plugs, while the 3.6L Pentastar V6 requires 6.
- The recommended service interval for both engines is typically 100,000 miles.
- NGK and Champion are often the OEM suppliers; choosing their aftermarket iridium plugs is a reliable and cost-effective option.
- On the 5.7L Hemi, the driver's side plugs near the brake booster are very difficult to access and may require special tools.
Engine Differences Matter
When shopping for spark plugs for your 2019-2024 Ram 1500 Classic, the most important factor is which engine you have. These trucks came with two main options, and their needs are very different.
- 5.7L Hemi V8: This engine is famous for having two spark plugs per cylinder, meaning you need to buy a total of 16 spark plugs for a complete replacement. This significantly impacts the total cost and labor time.
- 3.6L Pentastar V6: This engine uses a more traditional setup with one spark plug per cylinder, requiring a total of 6 spark plugs.
Always confirm your engine size before purchasing parts to avoid ordering the wrong quantity or type.
Symptoms of Failing Spark Plugs
When your spark plugs wear out, your truck will usually let you know. The signs can start small but will get worse over time. Look out for:
- Rough Idle: The engine may shake or vibrate more than usual when stopped.
- Engine Misfires: You might feel a hesitation or stumble during acceleration. A flashing Check Engine Light is a serious sign of a misfire.
- Reduced Fuel Economy: Worn plugs lead to inefficient combustion, making your truck burn more gas.
- Difficulty Starting: A weak spark can make it harder for the engine to turn over, especially when cold.
- Check Engine Light: A steady Check Engine Light can be triggered by codes related to engine misfires, such as P0300 through P0308.
Known Issues: Oil on Spark Plugs
Some Ram owners have reported finding oil on their spark plugs during a change, particularly with the 5.7L Hemi. This is often caused by failing O-ring seals in the valve covers. If you find oil in the spark plug tubes, it's a good idea to replace the valve cover gaskets and seals at the same time as your spark plugs to prevent future misfires.
Choosing the Right Aftermarket Spark Plugs
You don't have to buy parts from the dealer to get good quality. Many aftermarket brands are the original equipment (OEM) manufacturer, meaning they made the part for Mopar in the first place. For the Ram 1500 Classic, this is often NGK or Champion.
Brand & Material Tiers
Spark plugs come in different materials, which affects their performance and lifespan.
- OEM & Premium Aftermarket (Iridium/Ruthenium): Brands like NGK and Denso are top choices for the Ram 1500 Classic. Iridium and Ruthenium are very hard, long-lasting materials. They provide a strong, consistent spark for a very long time—often up to 100,000 miles. These are the best choice if you want to match or exceed factory performance and longevity.
- Quality Aftermarket (Platinum/Copper): Champion is often the OEM supplier and offers reliable performance. Some earlier Hemi engines used copper plugs which have excellent conductivity but a much shorter lifespan, sometimes needing replacement every 30,000 miles. For newer models, sticking with the recommended long-life iridium plug is usually best. Bosch is another solid choice available in various materials.
- Budget-Friendly: While brands like Autolite offer a lower-cost option, many Ram owners prefer to stick with NGK, Denso, or Champion for the best results and to avoid potential issues like hesitation or misfires that can sometimes occur with other brands.
A Note on "Upgrading"
Some owners have reported that "upgrading" from the factory-specified plug type (like from copper to iridium on an older engine) can cause performance issues. The ignition system is designed to work with a specific type of plug. For best results, stick with the material type your truck came with from the factory or a high-quality equivalent like NGK or Denso Iridium.
| Tier | Price Range (Per Plug) | Total for 3.6L V6 (6 Plugs) | Total for 5.7L Hemi (16 Plugs) |
|---|---|---|---|
| Premium (Iridium/Ruthenium) | $12 - $25+ | $72 - $150+ | $192 - $400+ |
| Standard (Platinum/Copper) | $4 - $12 | $24 - $72 | $64 - $192 |
Note: Prices are estimates and can vary by brand and retailer. The 5.7L Hemi's requirement for 16 plugs makes it a significantly more expensive job.
Frequently Asked Questions
How often do I need to change the spark plugs on my Ram 1500 Classic?
For the 2019-2024 Ram 1500 Classic with either the 3.6L V6 or 5.7L Hemi, the recommended replacement interval is typically 100,000 miles under normal driving conditions. However, if you frequently tow heavy loads or drive in harsh conditions, you may need to replace them sooner. Some earlier Hemi models required changes every 30,000 miles, but this was updated for later models.
Do I need to gap the new spark plugs?
Most modern iridium and platinum spark plugs from quality brands like NGK come pre-gapped from the factory. It is always a good idea to verify the gap with a feeler gauge before installation, but you should not attempt to adjust the gap on fine-wire iridium plugs, as you can easily damage the delicate electrode. The recommended gap for the 5.7L Hemi is often around .044 inches. Always check the specification for your specific plug and engine.
Is it hard to replace the spark plugs myself?
For a DIY mechanic, it is a feasible job. The passenger side is generally straightforward. However, on the 5.7L Hemi, the driver's side plugs, especially those near the brake booster, can be very difficult to access and may require special tools like swivels and various extension lengths. The 3.6L V6 requires removing the upper intake manifold to access the plugs, which adds complexity. If you are not comfortable with this, a professional mechanic can do the job in a few hours.
Are there any recalls or TSBs for my truck's spark plugs?
As of now, there are no widespread recalls or Technical Service Bulletins (TSBs) specifically for spark plug failure on the 2019-2024 Ram 1500 Classic models. Searches on the NHTSA database did not show any actions directly related to spark plug defects for this specific vehicle and year range. However, one customer satisfaction notification was found for certain 2025 model year vehicles with 6.2L engines due to an incorrect spark plug gap, but this does not apply to the 1500 Classic.
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Technical Specifications
OEM Part Numbers: SPLZFR5C11 68303913AA SP149125AE
Engine Type: 3.6L Pentastar V6 or 5.7L Hemi V8. Quantity (3.6L): 6 plugs. Quantity (5.7L): 16 plugs. Recommended Material: Iridium. Common Gap Size: ~0.044 inches (verify for specific plug).
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ram 1500 Classic: