Hi guys,

Was changing out the plugs on my M111 yesterday and found it had 4 electrode bosch plugs in it. They were quite sooty.

So decided to put plain old single electrode NGK plugs in. I have to admit they have been sitting the garage for a couple of years and had a few KM put on them - but the car runs alot better. Also took one back out and it was burning clean - very clean compared to the + 4 plugs...

Whats the general consensus on +4 plugs ?