Overall Rating
3.8 out of 5
3.8 out of 5
Open Ratings Snapshot
Rating breakdown 66 reviews
5 Stars
34
4 Stars
12
3 Stars
4
2 Stars
2
1 Star
14
49 of 66(74%)reviewers would recommend this product to a friend.
Product ReviewsWrite a review
Overall Rating
5 out of 5
5 out of 5
Very good plugs
January 13, 2015
By Mick1J
from Central, Minneapolis, MN, USA
" I like the design and results from Diamond Fire plugs. Pre set gap and great design make them good purchase. Improved performance and smooth running engine was exactly what I was looking for. The plugs did both. "
How often do you shop at JC Whitney.com? Multiple Times a Year
Overall Rating
5 out of 5
5 out of 5
I am impressed
November 15, 2014
By Firepro
from Dexter, ME, USA
" Not much for gimmicks, but I think these plug got me about 2 mpg, and a little more power "
How often do you shop at JC Whitney.com? Multiple Times a Year
1 of 3 people found this review helpful.
Overall Rating
5 out of 5
5 out of 5
about the same
September 3, 2014
By longrange
from Baton Rouge, LA, USA
" Works the same as a nonpreset spark plug. No noticeable improvements also. "
How often do you shop at JC Whitney.com? Once a Year
0 of 1 people found this review helpful.
Overall Rating
1 out of 5
1 out of 5
Not impressed
September 1, 2014
By Rob Zman
from Swedesboro, NJ
" I guess it depends on which vehicle you use these in, but my experience has been disappointing to say the least. I own a 2009 BMW X5 3.0 xdrive with 60k miles and installed these plugs August 2, 2014. the car calls for a Bosch or NGK double platinum. Against my better judgement I went with the E3s. My mileage went down to 17.7 mpg from 20 and there was hesitation when accelerating. I have pictures showing my 60,000 mile Bosch compared to the 2,500 mile E3. The E3 had an extreme amount of carbon deposits while the OEM Bosch plugs had normal wear. "
How often do you shop at JC Whitney.com? Once a Year
3 of 4 people found this review helpful.
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