spark plugs - any preferences?

[Pdwight]

But why wouldn't you use anti-seize on two dissimilar metals

[JFP in PA]

Originally Posted by Pdwight

But why wouldn't you use anti-seize on two dissimilar metals

Porsche has for many years recommended against using anti seize because many types commonly used in the EU are actually dielectric (read an insulator) and reduce the plug's ability to find a ground. The metal paste types used here are fully electrically conductive, which eliminates this issue while protecting the alloy heads.

Having had to repair several cylinder heads with plug holes whose threads came out still attached to the plugs, you would have to be nuts not to use it, but "old wive's tales" persist....

[78F350]

Originally Posted by JFP in PA

Porsche has for many years recommended against using anti seize because many types commonly used in the EU are actually dielectric (read an insulator) and reduce the plug's ability to find a ground. The metal paste types used here are fully electrically conductive, which eliminates this issue while protecting the alloy heads.

Having had to repair several cylinder heads with plug holes whose threads came out still attached to the plugs, you would have to be nuts not to use it, but "old wive's tales" persist....

Good to know. I got my original information to not use anti-seize from reading a couple posts by Loren on Renntech and the tech article on Pelican Parts.
There is a TSB from Porsche that said not to use any. I can not find that document on any official Porsche site. Here's a post with a picture of the original Tech Bulletin: Pelican Parts Technical BBS - View Single Post - Anti-Seize on Spark Plugs


Now I want to go back and put a dab of anti-seize on my plugs and I am editing my previous post.
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The correct torque for the spark plugs is also difficult to identify.
My hard-copy service manual updated through 2004 says, "30+3 (22+2) NM/Ftlb New" and "25+5 (18+3.5) NM/Ftlb Old".
That got some people to think it was a two-stage process.
Somewhere I read that that was a typo-bad translation and should have read +/- where is says +

Pelican Parts Tech article says "Torque the spark plugs to 30 Nm (22 ft-lbs)"

JFP in PA:

Originally Posted by JFP in PA

The only one that matters is Porsche: Spec is 22 ft. lbs. +/- 2 ft. lb.

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How often should you change the spark plugs?

Every 10,000 miles, or annually. "I recommend replacing your spark plugs every 10,000 miles, or about once a year. In reality, you can probably go longer than that, however, you never really quite know how long the plugs are going to last, or you may forget to replace them if you don't setup a yearly schedule."
Or every 30,000 miles.
Maintenance Schedule - Porsche Boxster (986) FAQ
Or every 60,000 miles.
https://sites.google.com/site/mikefocke2/maintenancemanualpagesfor%2701
...whichever comes first.