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Originally Posted by paulv
John,
I actually went looking thru the specific forums (since didn't find in the DIY sections) and found that thread. Thanks for your help. Since the cost of those parts are relatively inexpensive, it's probably a good idea to change them when changing the plugs regardless of whether they're leaking or not.
Regards,
paul...
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Hi,
In the vein of leaving well enough alone, I wouldn't recommend this. If they're not leaking, leave them alone. The possibility always exists that you may install them incorrectly, or a seal might shift when inserted and fail to make a proper seal.
Of course, the same is true if you were only to replace them when required, but then, you're forced to assume this risk.
What I would recommend is having a full set of fresh 'O' rings on hand when doing a Spark Plug change and again, only change the ones which leak. Keep the 'O' rings in a ziplok bag w/ all the air pushed out to keep them fresh. Hope this helps...
Happy Motoring!... Jim'99