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Yah sure the plugs can go the distance but how clean will they be. Doing the plugs its a good idea to add some anti seeze to the job.
Had the plugs changed in my 02 Boxster after about 90K miles on the plugs. The tech reported they came out ok -- had this set installed at dealer back when AOS failed -- but the electrodes were quite eroded.
The engine appeared to run just fine though.
I need to take pics of the Turbo plugs and the Boxster plugs and post. Maybe today at the office I can find the time to photograph and post pics.