Hey everyone. I've already compared the plugs to a diagnostic chart but I'm hoping you all might give me some good unbiased input. These were replaced today on my '05 X3 with 97K miles on the odometer. I've only had the vehicle a few weeks so I'm not sure if the plugs were original or not; perhaps they were changed at the dealer once before. They seem to show good signs to me, but what do you all think? Anything I might need to know?
The 4 ground electrode Plugs are especially made for 100k mile intervals.:thumbup:
On tests that have been done each electrode has about 25k in them so 4 of them would be 100k or close to before needing a change. Great plugs for longevity not for performance.
I remember when the quad-electrode plugs were first introduced around 25 years ago, and recall that the reason given for their design was to be more efficient in engines with higher-than-usual combustion chamber pressures, i.e., forced-induction and high-compression N/A engines. There were lots of turbo motors around back then.... it`s always been controversial as to whether the plugs actually help or not....
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