Replacing spark plugs at the right time is crucial for maintaining engine performance, fuel efficiency, and preventing engine damage. Here’s when you should consider replacing them:
In this article:
1. Based on Manufacturer’s Recommendation:
| Type of Spark Plug | Typical Lifespan |
|---|---|
| Copper | 20,000–30,000 km (12k–18k miles) |
| Platinum | 80,000–100,000 km (50k–60k miles) |
| Iridium/Double Platinum | 100,000–120,000+ km (60k–75k+ miles) |
📘 Always check your vehicle owner’s manual for the exact interval.
2. Based on Symptoms:
Replace spark plugs if you notice any of the following:
- Rough engine idle
- Engine misfires
- Poor fuel economy
- Sluggish acceleration
- Check engine light ON
- Unusual engine noise (knocking, pinging)
- Difficulty starting the engine
3. During Routine Maintenance
Even if there are no clear symptoms, spark plugs can degrade over time. Replace them:
- Along with ignition coils or wires, if they’re being serviced.
- After a major engine tune-up.
- If inspecting reveals carbon deposits, worn electrodes, or cracked insulators.
4. Based on Driving Conditions
Harsh conditions can shorten spark plug life:
- Frequent stop-and-go traffic
- Driving in dusty or extreme climates
- Towing or carrying heavy loads regularly
- Short trips where engine doesn’t fully warm up
Tip:
Always replace all spark plugs at the same time to maintain consistent engine performance.
Watch video of how to inspect spark plug.
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