I have now almost completed a full service on my 1.6 16v Mk4 Astra Sxi, except for the spark plugs!
The problem is my kit came with GM single electrode plugs that I think needs gapping, I don't have a gapping tool and I don't particularly want one for a one off job.
In the Haynes manual it mentions both vauxhall single electrode spark plugs which need gapping and vauxhall multi electrode spark plugs which don't need gapping (looking at the picture it shows 3 electrodes on the multi electrode spark plug).
I am guessing that the multi electrode plugs are easier to install correctly for the beginner as they don't need gapping accurately and surely they should also more efficient as there will be more sparks.
So my questions are:
Do GM actually make multi electrode spark plugs for the MK4 Astra as the Haynes manual states? And if so, can I use them on my vehicle?
I really only want GM spark plugs as I like to keep things as standard as possible.