I just bought four new spark plugs (NGK BPR6EKN) for my S4s. The manual says that they need a gap between 0.9 and 1 mm. The NGK site states a gap of 0.8 mm from new for the BPR6EKN.
So, should I widen the gap from 0.8 to 0.9 and if so, how could this be done? With a standard spark plug with only one side electrode it's pretty easy, but this one has two of them and I didn't find any advice in the net how to do this without breaking the electrode.
Any comments would be highly appreciated.