Hello all, I'm new to the club, I have a 1965 230SL, I wanted to replace the spark plugs but I was able to remove the front one and the last one, the 4 middle ones don't turn, I'm afraid of too much force may brake them... the vehicle is running ok but I do not know when was the last time my Dad, replaced them and he is no longer arround to ask :'(... any tips on how to removed them? ultimately the local mercedes dealer will service it; but I would like to do it my self. please advice.
Thanks