I have just fitted a set of NGK Iridium spark plugs to my Berlinetta and noticed instantly:
smoother idling
smoother acceleration
better burning
These were fitted to a Mitsubishi 2.6 litre 4cyl engine which has covered 170,000 kms. I know they are a lot more expensive but the good thing is you don't have to change them v often. May be every 100,000 kms.
I have also used them on my Lotus to good effect in that on that car they don't burn so sooty (are we allowed to use that word anymore?!)
Alastair
smoother idling
smoother acceleration
better burning
These were fitted to a Mitsubishi 2.6 litre 4cyl engine which has covered 170,000 kms. I know they are a lot more expensive but the good thing is you don't have to change them v often. May be every 100,000 kms.
I have also used them on my Lotus to good effect in that on that car they don't burn so sooty (are we allowed to use that word anymore?!)
Alastair