
Originally Posted by
TLSheff
I wouldn't. some suggest anti-sieze but I just roll them in and torque a little and don't worry about it. They're spark plugs not head bolts, they don't need a torque wrench or breaker bar to tighten them down, despite what some people have said.
A little in the boot is fine, helps keep the tip from rusting or corroding and helps keep a good connection so you get good spark. you just don't want so much that it kills the contact.