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He didn't say u couldn't. He sAid your not supposed to....
And that... once again, is incorrect.

For example NGK says their plugs should be good to go out of the box, but that it's ALWAYS a good idea to check the gap, and adjust it if needed. I hardly think a spark plug manufacturer would advise you to do something "you're not suppose to" with their product.
 

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And that... once again, is incorrect.

For example NGK says their plugs should be good to go out of the box, but that it's ALWAYS a good idea to check the gap, and adjust it if needed. I hardly think a spark plug manufacturer would advise you to do something "you're not suppose to" with their product.


iridiums have a different tip that coppers. its alot easier to break. so they say not to gap them.

believe what u want.
 

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Lol I gapped a set too I had autolite iridiums. The ngks were just awesome upon install and they were super affordable
 

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iridiums have a different tip that coppers. its alot easier to break. so they say not to gap them.

believe what u want.
I get the difference in iridium plugs. Several plug manufacturers say you can gap their iridium plugs. The End.

Anyway, I changed the plugs this weekend. The stock plugs didn't look "bad" but there was absolutely no anti-sieze on them, so I'm glad I change them now. I really appreciate how easy it is to do a tune-up on the G5 after doing my girlfriend's Chrysler and my mom's Kia.
 

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stay away from Bosch +4, I bought a set for my Colorado I had about four years ago, put them in, and all I got was a huge misfire of all four cylinders. I pulled them out, put the stock in, inspected the Bosch +4 and found out of all four plugs, three were missing at least one electrode... They are total crap. It ended up having the dealer break down the engine and re-honing the cylinder walls. I always use NGK or AC Delco from now on.
 

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I've got a set of stock AC Delcos on the way. Should be at my auto parts store tomorrow. Guess I'll put them in over lunch or after work. Probably after work since I'll have to take my car to town to get them at lunch and it will NEVER cool down enough to change them over lunch.
 

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I've got a set of stock AC Delcos on the way. Should be at my auto parts store tomorrow. Guess I'll put them in over lunch or after work. Probably after work since I'll have to take my car to town to get them at lunch and it will NEVER cool down enough to change them over lunch.
True. I pulled the coil packs off and stuck the spark plug socket w/ extension onto one of the old plugs. I would occasionally pull it out and grab onto the socket to see how warm it was... it took a few hours to cool down enough for me to be comfortable changing them.
 

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NGK makes good plugs, but after considering price and selection, if you own a non-boosted G5 GT, the smart thing to do is get the stock plugs.

Price is pretty close on iridium plugs. Around $7 ea. for Autolite, Bosch, and ACDelco Iridiums. Wanted to try NGK Laser Iridium, but they were $10 ea, so meh. Stock it was.
 

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Just put in some Bosch iridiums in this weekend, forgot about the cautions I saw here. I'm holding my breath on the 'breakage' issue; some had a good experience with them...so here's hoping. I did notice a quicker start instantly. Stronger 5th gear acceleration and torque (climbed a hill I normally had to down-shift well before the top for). I'm presuming that 0-60 is quicker, to. Fuel economy has yet to be determined, but I'm guessing it will be better...if I can restrain from exploring the new acceleration!! VBG
 
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