A couple weeks back I changed out the likely 20 year old plugs with a new set of Champion N12YC. Fairly easy/straightforward exercise and the car instantly sounds smoother to my ears. I’ve driven a few hundred miles since and all is well.
An engineer friend asked if I had gapped them or set the gap and I had no idea what he was talking about. I had basically just taken out of the box and swapped (after a thorough cleaning of the surrounding area).
Of course, he then proceeded to lecture about a heavy carbon build up and all sorts of other perils.
Is this something I need to be concerned with or was he just grinding my gears?