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DIY: Do It Yourself
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Old 07-03-2016, 06:25 AM   #1
05SMG
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How do these plugs look?

Changed out the original BMW spark plugs with NGK BKR6EOUP's and found a moderate amount of oil on the threads. Moderate meaning the threads were not dripping wet with oil but a little moist. All plugs looked the same as the photo.

Background: 05' 330ci with 72,000 miles.
VCG replaced 9,000 miles ago.
No misfires, or abnormal oil consumption.
Average MPG 27.4
Using Mobil 1 0W 40 oil changes every 7500 miles.

Thanks for any input.
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Old 07-03-2016, 07:11 AM   #2
Solidjake
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They look ok, similiar to mine at 90k. Oil is from the vcg that was leaking but you should be good now with the new plugs for a while. Expect the vcg to leak again in about 40k miles or so
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Old 07-03-2016, 08:31 AM   #3
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The business end of the old plug looks a bit dark. It should be grayish. Did you replace the 6 spark plug rings when you replaced the vcg? What brand was the new gasket?
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Old 07-03-2016, 10:15 AM   #4
05SMG
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Quote:
Originally Posted by Solidjake View Post
They look ok, similiar to mine at 90k. Oil is from the vcg that was leaking but you should be good now with the new plugs for a while. Expect the vcg to leak again in about 40k miles or so
Copy. Thanks
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Old 07-03-2016, 10:25 AM   #5
05SMG
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Originally Posted by markusmarkus View Post
The business end of the old plug looks a bit dark. It should be grayish. Did you replace the 6 spark plug rings when you replaced the vcg? What brand was the new gasket?
Rings? I don't know. The PO did the VCG and OFGH and I'm unable to determine what brand. I'm assuming it's non OEM as he wasn't a fanatic so now it's on the to do list. Another reason why people need to document maintenance and have part numbers which I do.
Thanks for looking at the plug.
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Old 07-04-2016, 08:07 AM   #6
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You're welcome. I'd replace the vcg with a gasket set and 13 (?) new grommets. Make sure the gasket set is made by a BMW supplier. The material was updated to Viton a few years ago. This is a much better material than the previous material.
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Old 07-04-2016, 08:21 AM   #7
05SMG
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Originally Posted by markusmarkus View Post
You're welcome. I'd replace the vcg with a gasket set and 13 (?) new grommets. Make sure the gasket set is made by a BMW supplier. The material was updated to Viton a few years ago. This is a much better material than the previous material.
Will do. In addition to looking for leaks along the head cover gasket area as a secondary check, I'll also pull the plugs in a couple of hundred miles to see if those threads are still brown with oil.

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Old 07-04-2016, 09:07 AM   #8
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Oil gets in that spot most commonly from VCG, the slight darkness on the plug is not out of the norm. Should really have posted all 6.
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Old 07-04-2016, 10:40 AM   #9
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Originally Posted by BKMrSteel View Post
Oil gets in that spot most commonly from VCG, the slight darkness on the plug is not out of the norm. Should really have posted all 6.
Better picture.
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Old 07-04-2016, 04:21 PM   #10
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All look good to me
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