I just put these in.
the plugs in my "new" 1990 525i were lookin bad, and my engine had a slight miss at idle.
the platinum +4s seem to be more responsive when accelerating
the engine still misses a little at idle. i'm thinking now that it might be a vacuum hose.
any thoughts on the advantages or disadvantages of these plugs would be appreciated. -and so would thought on my idle problem :confused