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Old 11-14-2012, 02:44 PM
joegr joegr is offline
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Location: Gulfport, MS
Join Date: Aug 2012
Posts: 203
Mein Auto: 2002 325i
Originally Posted by nivo View Post
The 4 ground electrode Plugs are especially made for 100k mile intervals.

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.
Funny, my Lincolns have single grounds on the plugs and they have a 100K mile service interval. They still looked okay at 100K miles when I changed them.
I'm not sure why BMW picked the four ground design, but I don't believe your theory at all. All four grounds should erode at about the same rate. There's no way that one is used up, then the next, and so on. Look at the pictures of the removed plugs, all four are still there, and all four probably have about the same wear.

I like to stick with what was designed in, so for the BWM, I replaced the plugs with ones with four grounds. For the Lincolns, I used single grounds.

Last edited by joegr; 11-14-2012 at 02:46 PM.
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