[3LiterBeater]

Decided to swap plugs out a little early as the car is tracked fairly often.

I'm fairly positive these look normal but may as well get a few opinions. These DFI engines always seem to run lean AFRs causing some "white" on the plugs.

~25k on these plugs, stock tune. No codes/ misfires/ indication that the car is running anything but as designed.

Share your pictures and opinions!

[DanG]

Plugs are recommended to be changed at three years or 30,000 miles which ever came first. Mine were done at three years under BMW maintenance.

[3LiterBeater]

Originally Posted by DanG

Plugs are recommended to be changed at three years or 30,000 miles which ever came first. Mine were done at three years under BMW maintenance.

Yep! Had my first set done at the dealer at ~14k miles.

I'm seeking others experiences as to why these plugs seem to have more white deposits versus some of the cars I'm used to seeing, to be more specific.

[DanG]

White usually means the plugs are running too hot.

Here is a reference: https://www.championautoparts.com/Pa...ark-plugs.html

[3LiterBeater]

Originally Posted by DanG

White usually means the plugs are running too hot.

Here is a reference: https://www.championautoparts.com/Pa...ark-plugs.html

While that chart is accurate on older engine, our DFI cars tend to run a much leaner AFR. This will cause a more efficient burn and higher combustion temps.

I'm asking for others to post their "used" plugs, preferably with some track time on them, so I may gauge if my plugs may be getting too hot. I suspect this is normal with track use

[3LiterBeater]

I've done a bit of digging and seemingly answered my own question. I've attached some other pictures that show similar results on plugs. I assume the excellent lighting in the garage I used played a role in how "white" the plugs are