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Discussion Starter #1 (Edited)
MS6 Spark Plug Reference List

Please do post corrections or suggestions-
I'll integrate to this post as appropriate

This was mostly copied & pasted from dozens of posts,
or taken from the '06 MS6 owners manual
-notes gathered mostly just to make my life easier.
-not meant to indicate the best or favorite, it's just a list.
-that said, the Denso ITV22 is often used as the baseline for one step colder performance.

based on US dollars
- from various on-line parts stores, prices will vary widely
=============================================

General Specs
14mm Thread Size,
25.4mm (1") Reach,
5/8" (16mm) Hex Size,
Tapered Seat,
Resistor

tightening torque: 8.0 - 10.3 ft/lbf, (10 - 14 N/m, 1.1-1.4 kgf/m)
anti-seize on threads recommended


What's this whole "Heat Range" thing about, and why do I care?
AutoliteSparkplugs.com
>It's believed that the Speed6 is damn near ready for one step colder from the factory.
>Colder plugs are an integral part of KR management


Pics of screwed up spark plugs, and what they mean
Spark Plug Diagnosis
As a general theory, your ceramic should wear to a nice coffee with lots of cream color. Bright white ceramic means you should try a colder plug. Dark needs hotter. Beyond that, if your plugs ever end up looking like anything in these pics, well, you've got much bigger problems than this post is going to help with...


Just what the heck do those numbers mean anyway?
Reference Charts:
NGK - NGK spark plugs symbol code
Autolite - http://www.autolitesparkplugs.com/images/autolite%20numbering.jpg
Denso - Untitled Document
Champion - Untitled Document


Just how long can I expect my fancy new plugs to last?
Both Cobb and Denso have written on the subject. Denso has a generic note that indicates a lifespan of about 30K miles, but Cobb is even more conservative and notes the hell that is a DISI Motor will see the benefits dropping off after only 15K miles:

Per the Cobb MS3-MS6 Service Bulletin v1.03:
"...operating the car with higher than stock boost levels or with the calibrations that are on the AccessPORT, require that a spark plug gap of .026” - .028” (6.6 – 7.1mm) be used on a 1-step colder temperature plug. Denso currently offers this spark plug as part # ITV22 (please be sure to verify each plug is properly gapped before installing them). Our experience has shown that operating your turbo-charged engine at higher than stock boost levels requires that your spark plugs be replaced at around 15,000 mile intervals."


Colder Heat Ranges
generally accepted gap, where adjustable, .026 (range .025 to .030)
====================
>Autolite Single Platinum Spark Plug
Part No. AP5263
$2.50

>Autolite Double Platinum Spark Plug
Part No. APP5263
$4.00

>Autolite Xp (Xtreme Performance) Iridium Enhanced Fine Wire Spark Plug
**Cross-references the Denso ITV-22**
Part No. XP5263
$6.50

>NGK IX Iridium
Part No. LTR71X-11
$8.00 ea.

>Denso Iridium Spark Plugs
Part No. ITV22 - one step colder
$11.99 (streetunit price)

Part No. ITV24 - two steps colder
$11.99 (streetunit price)



Factory Heat Range
generally accepted gap, where adjustable, .030 (range .028 to .032)
====================
>Autolite Double Platinum Spark Plug
Part No. APP5364
$3.99

>Champion Double Platinum Spark Plug
Part No. 7437
$4.29

>Motorcraft Original Equipment Finewire Single Platinum Spark Plug
Part No. SP432
$4.69

>Motorcraft Original Equipment Finewire Double Platinum Spark Plug
Part No. SP478
$4.69

>Bosch Platinum+2 Spark Plug
Part No. 4315
$4.99

>Bosch Platinum Ir Fusion
Part No. 4515
$5.71

>Bosch Platinum+4 Spark Plug
Part No. 4488
$5.99

>Pulstar Platinum Pulse Plug
Part No. EF1P
$9.99

>ACDelco Professional Platinum Spark Plug
Part No. 41-814
$6.49

>Champion Iridium
Part No. 9901
$5.74

>NGK Premium Iridium
Part No. ILTR6A8G
$9.94

>Autolite Xp (Xtreme Performance) Iridium Enhanced Fine Wire Spark Plug
Part No. XP5364
$6.59

>Pulstar Iridium Pulse Plug
Part No. EF1I
$12.99

>E3 Premium Special Electrode Automotive Spark Plug
**at least two reports of exceedingly poor performance in the MS6**
Part No. E3.66
$5.99
 

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great post man !

this needs to be added to the noob thread for sure
 

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I love info....thanks for the valuable info. Newbies, please read and study...there will be a quiz later!!
 

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Rock Auto has some different part numbers which i highlighted in red. are those correct also ?

also some additional rices for your list.


Double Platinum



AUTOLITE Part # APP5364 {#APP5344} Double Platinum
Gap .051 - $3.62




Platinum


BOSCH Part # 4315 PLATINUM+2
Do not gap. Gap is not Adjustable;Original Equipment is Iridium. - $3.86




BOSCH Part # 4488 PLATINUM+4
Do not gap. Gap is not Adjustable;Original Equipment is Iridium. - $4.52




ACDELCO Part # 41814 {#19238479, 19250985, 88901020} PLATINUM PLUG
SPARK PLUG .051 GAP - $5.53




Iridium


AUTOLITE Part # XP5364 Xtreme Performance
OE Style; Gap .051 - $4.37




BOSCH Part # 4515 PLATINUM IR FUSION
Do not gap. Gap is not Adjustable;Original Equipment is Iridium. - $5.71




NGK Part # 3787 {#ILTR6A8G} Premium Iridium
{.032 gap} - $9.94




CHAMPION Part # 9901 Iridium
OE Style - $5.74
 

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Discussion Starter #5
thanks--
op updated
added new items
sorting order changed to materiel (plat, irid etc) instead of price
 

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just got my denso itv-22's today. now i just some warm weather lol !
 

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:):):).
 

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:woowoo:


I just hope they don't get wrecked like my set of ngk's i installed about less then 10k miles ago and waste more money lol

damn things are pricey...
 

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Great post man! I just came across this from your linky. I'll post a link to this in the FAQs- Thank you!

EDIT: NM it was already in there! lol Good stuff!
 

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Discussion Starter #11
First post updated to include the following text:


Just how long can I expect my fancy new plugs to last?
Both Cobb and Denso have written on the subject. Denso has a generic note that indicates a lifespan of about 30K miles, but Cobb is even more conservative and notes the hell that is a DISI Motor will see the benefits dropping off after only 15K miles:

Per the Cobb MS3-MS6 Service Bulletin v1.03:
"...operating the car with higher than stock boost levels or with the calibrations that are on the AccessPORT, require that a spark plug gap of .026” - .028” (6.6 – 7.1mm) be used on a 1-step colder temperature plug. Denso currently offers this spark plug as part # ITV22 (please be sure to verify each plug is properly gapped before installing them). Our experience has shown that operating your turbo-charged engine at higher than stock boost levels requires that your spark plugs be replaced at around 15,000 mile intervals."
 

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It's probably just me not looking correctly since I'm a noob, but I can't find the plugs I want. I've heard good reviews about these two.
>NGK IX Iridium
Part No. LTR71X-11
>Denso Iridium Spark Plugs
Part No. ITV22 - one step colder

I've checked my local stores of autozone, advance auto parts, oreilly auto parts, and their websites. I've checked autopartswarehouse.com. Can anyone provide a link to a website that they've purchased these plugs from?

I've found this forum really helpful in figuring out what I want to do with my car. The only thing I've done to my 06 MS6 so far is EBC Redstuff brake pads and EBC dimpled and slotted rotors. Looking forward to the real modifications when I get some more money saved up.
 

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Discussion Starter #13
Google - Denso ITV22
Several places have the for sale at the above link

From the question, I'm gonna suggest just picking up the ITV22 as they come pre-gapped at .028, so you can just verify the gap & install. The NGK's come with a monster huge gap of .044 and can for some folks be a real snot to adjust down to the needed gap without screwing up.
 

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Anyone running the Autolite XP's? How do they compare to the Denso ITV 22. TIA
 

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Discussion Starter #16
Much like the NGK step colder plugs you'll get slightly less life out of them due to the gap angle that's required. This never bothered me tho since I replace plugs more often than most.

Performance wise I doubt you'll be able to tell the difference until after ~10,000 miles compared to the Denso's.

I've run all three autolites, the ngk's and the itv22's. When new & gapped the same they perform comparably. As they age the differences become apparent, especially so if you run higher boost like I do.

My car loves fresh plugs, and I tend to change them ~12-15K miles. The denso's will see as much as 17k-ish. The XP an NGK's will see ~15k-ish, the AP & APP barely see 10K
 

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Thanks Ti....always a well thought-out answer from you.
 

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Farm and Fleet has them for $4.99, plus there is a $2.00 per plug rebate!! FTW!!
 

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Thanks for striking up this convo.... I just realized how old my plug are..... ITV22's going on 20k miles.... just ordered NGK (6510) LTR7IX-11 Iridium IX Spark Plug.... not sure how I overlooked those being due.
 

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I had over 40k on mine before i had noticeable issues... Gap had opened up to .028 from .026, which IMO is really the only reason they recommed replacing them. They looked just fine otherwise.
 
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