I tried to remove the plus previously, but even leaving WD40 in the well overnight they refused to unscrew. I don't want to apply too much force with the socket wrench in case I break the plugs.
Maybe I will leave them until I have to next visit a dealer!
Hi Clock, Forgive me if I'm teaching granny and all that, but WD40 really isn't a particularly good penetrating oil. Try some PlusGas. When it comes to undoing the spark plugs, I find a very high torque applied slowly is less likely to damage the plugs than a shock load - and of course a very close-fitting plug socket with the correct rubber insert is always a good idea.
