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Champion 7975 double-platinum plugs not recommended

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Old 06-25-2017, 03:56 PM
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'99 and '05 E55 AMG
Champion 7975 double-platinum plugs not recommended

As the title says, I do not recommend the Champion 7975 double-platinum spark plugs. I installed them gapped at ~0.040" and 35,000 miles later, the electrodes had eroded to ~0.058" to 0.060". I strongly suspect this was the reason for the failure of cylinder #1 a few weeks ago as the gap on those two plugs was > 0.060". I bought 16 on sale and with rebate for $41; now it doesn't seem worth the money I saved.

Yesterday I installed a set of the Bosch FR6MPP332 spark plugs (in 2 1/4 hours) gapped at ~ 0.034". Cost was $120 for a set of 16.

FWIW, the factory installed plugs made it ~90,000 miles with no issues.

The photo shows a typical gap of the plugs I removed from the car versus the Bosch gap new.
Attached Thumbnails Champion 7975 double-platinum plugs not recommended-img_20170624_114441117.jpg  
Old 06-26-2017, 01:56 PM
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2007 Mercedes E63 AMG
my friends have blown many of these plugs up. they do not work for anything that makes more than 100hp.
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Old 06-26-2017, 03:51 PM
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2005 E55 AMG, 1991 MR2
Are those the factory plugs you replaced them with? Has anyone tried the brisk silver?
Old 06-26-2017, 07:21 PM
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2002 CLK 55 AMG cabriolet Eurocharged
Champion plugs are good for lawnmowers and 4 cylinder Chrysler. Chevy same difference.

Stick with Nipiondenso, Bosch, NGK.

Cheers

RN12YC will not fit the chevy sorry

Last edited by GatorMB; 06-26-2017 at 07:27 PM. Reason: added content

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