I think I'd fit whatever BMW advise: the originals are, I believe, some sort of special metal plug tip. BMW say they are good for 100,000km = 60,000 miles. Given the price and the need to remove the wings it isn't something that needs to be rushed into!

Found this on the web... https://www.bimmerworld.com/Engine/Ignition/NGK-Spark-Plugs-BKR6EQUP-12-12-0-037-607.html

Platinum tipped.


Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...