Denso Spark plugs?
Thread Starter
Joined: Jun 2005
Posts: 1,415
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From: Louisiana
Denso Spark plugs?
I've been trying and trying to find information. I went ahead and ordered Denso plugs. I like NGK I've just never had any luck with them. Anybody else use them? Any clearance issues?
I use the denso's because they are generally more available and about half the price of NGK's.
Comparing the two brands, it would be hard to note any differences. Denso was the original stock plug for the FB's.


The denso plug on the left is new, the NGK on the right is used
Comparing the two brands, it would be hard to note any differences. Denso was the original stock plug for the FB's.


The denso plug on the left is new, the NGK on the right is used
Joined: Aug 2011
Posts: 3,078
Likes: 42
From: Cambridge, Minnesota
No kiddin! Except for the print on it I don't think I could pick out the differences. And at half the price I might be getting a new set of plugs sooner than I woulda!
Joined: Mar 2001
Posts: 31,833
Likes: 3,232
From: https://www2.mazda.com/en/100th/
Denso is still the original plug installed at the assembly line, although its not 100%. traditionally they were really hard to come by, but if you can find them they are fine
Denso's are currently available at rockauto, at $4.03 each they've gone up a bit but still not a bad deal.. The NGK's aren't bad either, at $4.94
DENSO Part # 3104 Click for more information about this part {#W25EDR14} Copper
Gap 0.055; DENSO is O.E. Manufacturer /
$4.03
Add Part
NGK Part # 2329 Click for more information about this part {#BR8EQ14} Standard One of our most popular parts
.055; OEM/OES Spark Plug
Part Image
$4.94
Add Part
DENSO Part # 3104 Click for more information about this part {#W25EDR14} Copper
Gap 0.055; DENSO is O.E. Manufacturer /
$4.03
Add Part
NGK Part # 2329 Click for more information about this part {#BR8EQ14} Standard One of our most popular parts
.055; OEM/OES Spark Plug
Part Image
$4.94
Add Part
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