The truck is currently using Autolite XP5245 iridiums. Normally I would go with something from NGK but I figured if the Autolites were a decent price I would get them and they would probably last the life of the truck
If its just painted like some cheap plugs such as some autolites then yes its needed.
I was looking at pictures of the V12 engine found in the Toyota Century. Then I noticed the spark plug/coil arrangement: Interesting.
So here is my experience with gaps on this engine. The wife 09 Passat was misfiring so I decide to replace the plugs. I buy Autolite double platinums which were gapped huge. Turns out the 0.032 gap was not correct after all and it should have been 0.028. Big difference, this baby flies again (GIAC tune).
Autolite 4162's, I changed them out every 1000 miles.
Yeah, get rid of those: autolite is junk.
My dad just returned a set of autolites. I installed them and had immediate misfire.
Once we got a good local supplier for Motorcraft plugs a few years ago we almost never install Autolite.
There seems to have been quality issues with those for quite a while. I couldn't count how many times we removed fairly new Autolite spark plugs and replaced them with a better brand to fix a misfire.
I wouldn’t put autolite plugs even in my lawnmower. NGK or Denso only.
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