How Often Should the Spark Plugs Be Replaced on an Atenza?

[McRose]

The spark plugs on an Atenza should be replaced approximately every 40,000 to 60,000 kilometers. As a critical component of the gasoline engine's ignition system, they introduce high-voltage electricity into the combustion chamber, causing it to jump the electrode gap and generate sparks to ignite the combustible air-fuel mixture in the cylinder. The Atenza is a mid-size sedan produced by FAW Mazda. Taking the 2020 Atenza Skyactiv-G Fashion Edition as an example, its body dimensions are: length 4870 mm, width 1840 mm, height 1445 mm, with a wheelbase of 2830 mm. The 2020 Atenza Skyactiv-G Fashion Edition is equipped with a 2.0L naturally aspirated engine, delivering a maximum horsepower of 158 PS, maximum power of 116 kW, and maximum torque of 202 N·m.

[McAllie]

The factory recommends replacing spark plugs for the Atenza at 80,000 to 100,000 km, but actual usage depends on driving habits. For someone like me who commutes 30-40 km daily, cold start issues appeared at 70,000 km. Upon removal, the electrodes were visibly eroded. The mechanic explained that the Skyactiv engine's high compression ratio puts greater load on spark plugs, and frequent city traffic congestion leads to more carbon buildup. I suggest inspecting them every 5 years or 60,000 km—if the ceramic insulator shows yellowing or the electrode gap is too wide, replace them immediately. Although the factory iridium spark plugs are durable, thinning electrodes cause incomplete combustion, stealthily increasing fuel consumption by over half a liter.

[LaHarmony]

I've been using the Atenza for six years, and my personal experience is not to strictly adhere to the manual's recommended mileage for spark plugs. Once, when I drove up to 90,000 kilometers, the acceleration suddenly felt sluggish, and it turned out that the electrode of the third cylinder's spark plug had melted a gap. Later, I specifically asked an engine engineer about it, and he said that the working temperature of spark plugs in direct injection engines can reach 850°C, and frequent hard acceleration for overtaking can cause more damage. Now, during my own maintenance, I check the combustion condition: if I find black powder at the tailpipe, I replace them early at 70,000 kilometers; if I do a lot of highway driving, they can last up to 100,000 kilometers. Remember to use the original factory model NGK ILKAR7L11, as a mismatch in heat range can trigger the fault light.

[DeSamuel]

During last year's maintenance, it was discovered that the Mazda6 (Atenza) had a cylinder misfire at just 60,000 km. The culprit was low-quality gasoline causing the spark plug threads to seize up. The mechanic said this situation is particularly common nowadays, as ethanol gasoline has high gum content, leading to spark plug side electrodes accumulating black carbon deposits in just three months. Now, I have the workshop use a borescope to inspect the ignition end every two maintenance sessions - prevention is far better than breaking down. The factory manual's recommendation of replacement at 100,000 km is purely ideal; vehicles frequently used for short commutes should replace them every 5 years without fail. By the way, when replacing, remember to have the technician apply anti-seize compound to prevent cylinder head thread damage during next removal.