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#2770629 - 10/12/12 12:08 PM 2005 Honda Civic - NGK Iridium or Denso Iridium Lo
DuckRyder Offline


Registered: 10/20/05
Posts: 2693
Loc: Atlanta
NGK Laser Platinum Spark Plug S(PZFR6F-11)

Denso SKJ20CR-A8 Iridium Long Life Spark Plug

For another 100,000 miles?

Any reason to chose one over the other?
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  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
  • 2012 Volkswagen Jetta TDi

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#2770631 - 10/12/12 12:14 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
bourne Offline


Registered: 12/20/06
Posts: 1392
Loc: Greenwood, IN
Both are oem/oes recommended plugs. Negligible performance difference or life difference. Whichever is less expensive. Also see if ngk iridium ix are available. They are preforming excellent in my Acura atm. Civic has Bosch iridiums , sort of as an experiment since everyone says don't use Bosch in an Asian vehicle. So far no difference in performance or mileage.
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#2770633 - 10/12/12 12:15 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
sciphi Offline


Registered: 03/24/07
Posts: 9698
Loc: Upstate NY
What came OEM? IIRC Denso plugs were OEM on our Fit. I'll throw another set of those Densos at it in 30k miles when it hits 80k miles. No complaints about their OEM plugs, since they work fine.
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#2770634 - 10/12/12 12:16 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
SuperDave456 Offline


Registered: 10/29/08
Posts: 2430
Loc: Dallas, Texas
The platinum plugs are good for 100,000 miles.

The Iridium can go quite a bit longer than that.

I'd figure out what the car came with and stick with that.

On my Taurus after 98,000 miles the plugs looked pretty good. However, the rest of the ignition system needed to be replaced. The Solenoid pack and wires looked pretty bad and I imagine that it was the Solenoid that had given up the ghost. However, I decided to replace the plugs.

Just something to think about.

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#2770646 - 10/12/12 12:32 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
Gotch Offline


Registered: 10/27/11
Posts: 169
Loc: Ontario Canada
I'm running IR Fusion in my 06. 100k (km) still running great. Slight increase in throttle response, mileage is a wash.

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#2770649 - 10/12/12 12:34 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
DuckRyder Offline


Registered: 10/20/05
Posts: 2693
Loc: Atlanta
This particular one came with NGK's but the two plugs listed in the OM/SM are:

NGK: PZFR6F-11
Denso: PKJ20CR-M11

The NGK Iridium Ix Spark Plug (ZFR6FIX-11) is available as well but was under impression that the ground electrode on those is not Iridium.

The NGK's are cheaper but it isn't a huge issue. It is normal maintenance no issues with the car or the rest of the ignition system.
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Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
  • 2012 Volkswagen Jetta TDi

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#2770672 - 10/12/12 01:04 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
bourne Offline


Registered: 12/20/06
Posts: 1392
Loc: Greenwood, IN
OEM plug is a double platinum plug. Question here is do you want to put double platinums back in or replace them with Iridiums ?

If double platinum then stick to NGK oem plug.
If Iridium , then I highly recommend NGK IX series #ZFR6FIX-11, with Denso #SKJ20CR-A8 being a close second recommendation.

Here are the links to the home pages of both plugs :
NGK Iridium IX
Denso Iridium Long Life
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#2770682 - 10/12/12 01:20 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
Audioquest Offline


Registered: 03/07/04
Posts: 361
Loc: Southwestern Ontario
Although either NGK or Denso can be installed at the factory, I have always liked to run NGK in a Honda and Denso in a Toyota. There are hundreds of horror stories on the net about Bosch plus in Japanese engines, but I have run the standard Bosch Platinum in my 1991 Honda CRX without issue. What seems to be the culprit is the Bosch multi-prong grounded plugs like the +2 and +4 causing misfires. Oddly, my CRX came equipped from the factory with Champion plugs and it never skipped a beat. I now use NGK G-Power Platinums in it.
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#2770713 - 10/12/12 01:49 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
dparm Offline


Registered: 04/19/10
Posts: 13029
Loc: Chicago, IL
I ran Bosch plugs for 50k in my Integra GS-R and in my S2000. Not a single misfire code or anything like that. Total hogwash that Bosch doesn't work in Japanese motors.
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#2770718 - 10/12/12 01:53 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
Chris Meutsch Offline


Registered: 02/27/06
Posts: 2414
Loc: Cincinnati
Use the Iridium. I used NGK in my 2001 Civic for 100k runs. Never an issue.
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#2770811 - 10/12/12 03:24 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
Mr Nice Offline


Registered: 09/12/04
Posts: 16902
Loc: Orlando, FL
NGK with AAP discount code.
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#2770878 - 10/12/12 04:23 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
wirelessF Offline


Registered: 10/04/07
Posts: 1606
Loc: Oahu, Hawaii
You want to use the Denso LL or the NGK Laser Plats/Iridiums for long life operation. They have a platinum ground strap for minimal erosion. The NGK Iridium IX is NOT a long life spark plug since it does not have a plat ground strap. I had them for 40K in my Toyota Tundra V8 and the ground electrode started to erode.

I have Denso LL's in my 02 Chevy Silverado 5.3L, replacing the OE double plats @ 92K. And yes it runs fine despite people saying it need murrrican* spark plugs.

*ACDelco, Champ, Autolite.


Edited by wirelessF (10/12/12 04:24 PM)

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#2770883 - 10/12/12 04:26 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
DuckRyder Offline


Registered: 10/20/05
Posts: 2693
Loc: Atlanta
Well, had to order them by 4:59 to use the discount code.

Guess we will how the Iridium does, I can always stick a set of the Honda ones in it if I don't like anything about them.
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Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
  • 2012 Volkswagen Jetta TDi

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#2770957 - 10/12/12 06:05 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: DuckRyder]
PandaBear Offline


Registered: 08/05/02
Posts: 13298
Loc: Silicon Valley
If both plug model are OEM, then they have tested it when designing the engine / car and have told both companies to adjust / fix any problem found, and therefore should perform close enough and either should work.

Other brands may also work, but since it is only tested by the plug manufacturer and not the car manufacturer, you'll never know how much of a difference (if any) it is making.
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#2771010 - 10/12/12 07:17 PM Re: 2005 Honda Civic - NGK Iridium or Denso Iridium Lo [Re: dparm]
antiqueshell Offline


Registered: 03/02/12
Posts: 5133
Loc: chicago, Illinois
Originally Posted By: dparm
I ran Bosch plugs for 50k in my Integra GS-R and in my S2000. Not a single misfire code or anything like that. Total hogwash that Bosch doesn't work in Japanese motors.


Exactly, this is internetz rumor mill nonsense.

Now granted it is true that GENERALLY you should stick with the same number of ground tips that came with your car. However in many cases even this is not an issue, as I know of MANY models that have identical engines in a number of markets yet each market will specify different plugs with a different number of ground tips.

ACTUALLY THE MOST CRITICAL SPARK PLUG SPECS ARE

1) Thread pitch
2) Length of plug in combustion chamber
3) Heat range

The others are less critical

4) Number of ground tips
6) Electrode metal and or design
5) type of metal


I think NGK has a vast viral marketing arm that flood DIY sites like this and push NGK with various claims, all of which are dubious at best.


Edited by antiqueshell (10/12/12 07:20 PM)

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