When antiseize is applied, your torque reading is compromised and you'll overtighten, increasing liklihood of stripping threads.

In addition, the antiseize will harden and fall into the cylinder next time you remove sparkplugs.

Generally speaking, the main use of antiseize is when joining dissimilar metals--like the steel of a plug and the aluminum of a cylinder head--and there is NOT a problem obviously with aluminum. The problem is the other things mentioned.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles