Never heard of that... Guess it would hurt anything though.
Never heard of plug gaps closing before, defies the law of physics surely?I don't think it would hurt, but it shouldn't be needed. If gaps are changing on one, but not the others, wouldn't that signify an issue? Also, I just checked mine after a long winter. They were all down to around 023 from the original 028 I put them at. Iridiums.
I've noticed this as well on mine too, when I first did mine I set them at 0.28 and that one jumped to 0.35 while the others were around 0.32I usually put them back in the same cylinder. I'm not the only person who has reported the right hand cylinder wearing the plugs a little faster so I'm inclined to think this is a design quirk.
That makes more sense than the gaps getting smaller, I would need to see them close up again to believe this could happen at all.I've noticed this as well on mine too, when I first did mine I set them at 0.28 and that one jumped to 0.35 while the others were around 0.32
Besides checking mine/anti-seize just after 3K, have almost 70K on my original plugs. Not gonna mess with them at all, probably will trade the car before I do. Yes I realizes GM lowered the maintenance schedule to 60K in 2013+, but GM can't expect me to do anything other than follow what's listed in the back of my 2012 manual, which says 100K maintenance.I've done mine numerous times and am already on my 4th set of plugs. Going on my 5th. (Long story)