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Which NGK plug are you guys running? Originally 7 years ago I installed some NGK TR55 plugs (had been using V-power plugs for years in other vehicles), 5 years ago I installed some NGK TR55GP, now I'm looking to do plugs again and am thinking either TR55IX or ITR5H13 although i'm leaning toward the TR55IX. Any opinions out there and why.
 

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switched from the TR 55's to Autolite AP 106 on the recommendation of Ed Wright.

If you want to run a Iridium get the XP 106 or the APP 106 if you want double platinum

You may notice the Autolite ceramic is slightly wider
 

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switched from the TR 55's to Autolite AP 106 on the recommendation of Ed Wright.

If you want to run a Iridium get the XP 106 or the APP 106 if you want double platinum

You may notice the Autolite ceramic is slightly wider
On this subject, I decided to look them up, and noticed there's an active rebate for them.

Autolite Spark Plug Rebate
 

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Here's a pic of one of my plugs that have been in use for 5 years now. This is the NGK TR55GP.
How many miles is that?
 
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