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Always check the gap! These plugs are pre-gapped, but pass through many hands before they're in your hands. These things are gapped to thousands of an inch, one clumsy guy on the UPS pkg. line and they need to be re-gapped. Cannot tell you the gap because you failed to identify the my/model of your car.
Plugs are the cheapest maintenance you can do to your car, so plan on swapping every two years. This also gives you the opprtunity to stay abreast of any leaky tube problems and ensures you won't have a plug sieze in the head.
Again, if your car is 10 y.o. or older, it may be wise to swap the o-rings now, otherwise on an as needed basis. It's a good idea to have some o-rings and maybe even some tubes on hand.
This isn't major surgery and so the 'while I'm in there' philosophy doesn't apply like it would for say RMS at clutch time.
Cheers!
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