I cannot understand the rationale of buying plugs that are supposed ok for 40k miles....!>!> That is like three years use for most people.
I honestly believe the longlife serviceing idea on VAG cars is ridiculous, it kids people into thinking that their cars will be trouble free for this time period. With a turbo car, if you do regular basic maintenance like oil changes (with decent but not overpriced) oil, every 5-10k miles, plugs once a year and keep you eye on levels etc, they should be pretty relaible. But the longlife idea of oil for 20k miles (maybe 2 years!!), plugs for 40k miles, I think makes some owners forget that they should keep their eye on their cars regualrly.
Although maybe I ma just an old fuddy duddy who remebers the days of mineral oils, turbo times and keeping your points gap correct so your timing is right!!! LOL
I just oredered some Copper NGK BKR7E plugs for my BT s3, its done 8k miles on the current ones since last June. £13.27 deleivered for all 4!. I am sure they will run another 10k miles, but I will feel happier with them changed!!