The plugs on mine were replaced at 22000 Miles as the result of a error message that was read out.
If you are interested in more details:
Spark replacement was the result of 3 weeks diagnostics at McLaren dealer here in Brussels.
My 2013 Spider had quite a irregular cold start. Afte 3 secs the engine seemed to stutter down to 600rpm and then up to 2500rpm and down again and up .... during 2 following minutes, but not when I started driving... immediately after 5 secs.
I some cares in the first 5 minutes of driving, the car would tremble while in high gear at low speeds when I pushed the pedal, 5 th or 6th gear at 30 miles/hour. Then the engine light would blink for 30 secs and then go away.
With these facts, I left it weeks at the shop with my suggestion of a possible problem with the driveline dampers.
I read on DLD issues in another forumthread about irregular cold start.
DLD change is a serious expensive job so Mclaren warranty service let them do all sorts of tests, resets, but they couldnt find any error message of any kind. Except my car tremble error seemed to have been reported as a misfire error. This lead them to replace all sparks, a 650usd job not covered by warranty...although they should normally be replaced at 50000miles...
the irregular rpms at cold start where still there, painful feeling:crying:
but the car trembling didn’t happen anymore.
After 1500 miles to and from the Italian alps via Germany, the cold startup is not irregular anymore, great I think.
But today the car trembling and engine light issue is back, way longer and I had to stop/start the car. :crying:
So also