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Inspecting and Exchanging Plugs / Sevice Life – DENSO SPARK PLUG

Inspecting and Exchanging Plugs / Sevice Life

Guideline for replacing plugs

When the tip of the center electrode becomes worn to a rounded shape, this interferes with sparking and may prevent stable ignition of the fuel mixture. Because this can lead to reduced horsepower and poor mileage and can have a negative effect on engine life, replacing the spark plug is recommended.

Recommended timing for replacing normal spark plugs

4-wheel passenger vehicles: 15,000 to 20,000 km
Light automobiles: 7,000 to 10,000 km
Motorcycles: 3,000 to 5,000 km

We recommend that you check and replace your spark plugs as necessary for favorable driving.

Time for replacement

These kinds of problems can occur!

  • Poor mileage
  • Poor engine starting
  • Reduced horsepower
  • Unstable idling
New plug

Effect following spark plug replacement

  • Improved mileage
  • Improved startability
  • Improved acceleration
  • Stable idling