Spark Plugs - Colder Plugs - Heat Ranges

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Jul 20, 2010 | 02:42 PM

#41

J. Dub

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From: In your internets.

Quote:

Originally Posted by ac419

oh ok.. thanks! i just want to get the best between the two

As long as you're changing the spark plugs when they go bad or begin to show actual signs of wearing, then you're doing great. I'd get the cheaper of the two you mentioned.

Jul 26, 2010 | 05:59 AM

#42

TITANG9

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From: PUERTO RICO

Well, i'm using:
Denso Iridium
IKH16------------------5343-------------Stock heat range

I did feel a difference; but being honest, I think it was because the old platinums had over 120,000 miles, and they looked almost destroyed...lol

G35 sedan 2003....135,000 Miles

Last edited by TITANG9; Jul 26, 2010 at 06:00 AM.

Jul 26, 2010 | 06:48 AM

#43

viceversa

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From: SoCal

yeah man i changed mine at 50k and they looked terrible!!! I cannot imagine what they would look like at 120k!

Jun 29, 2020 | 03:39 PM

#44

Arturo Mireles

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Joined: Jun 2020

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From: California

Quote:

Originally Posted by done12many2

List of spark plugs available in multiple heat ranges for the VQ35:

Brand-------------------Stock #-----------Heat Range

NGK Iridium
LFR5AIX-11---------- 4469------------- Stock heat range
LFR6AIX-11---------- 6619-------------1 step colder
LFR7AIX--------------2309-------------2 steps colder

NGK V-power (standard plug)
LFR5A-11------------- 6376-------------Stock heat range
LFR6A-11------------- 3672-------------1 step colder

Denso Iridium
IKH16------------------------------------Stock heat range
IKH20------------------------------------1 step colder
IKH22------------------5345-------------2 steps colder
IKH24------------------5346-------------3 steps colder
IKH27------------------------------------4 steps colder

I searched the threads, but could not find one location of reference for spark plugs. These are just the ones that I did research on. However, if you know of more plugs, please let us all know!

NGK # 2309 Iridium Spark Plugs LFR7AIX ---- 6 PCS NEW so these are considered 2 step colder for a vq35?