Today changed the cap and rotor.Car stalled x1 2 months ago,not since.Changed out Bosch plat,put in TR5 NGK copper plugs,dealer changed fuel filter 1st time since new?,
New cap orange ceramic made in Spain,old one made in Germany greenish cuso4 contact points,centre blackened.Mew rotor black ceramic(Spain)old one Germany(orange,contact points looks OK,not oxidised)Greatest diff is the lack of tool esp for the hard to reach bottom 5 mm bolt.(3 5mm bolts hold the cover black and the orange ceramic cap down),3 3mm holds the rotor down.
Since change car idles better and quieter.

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Tom 1992 300E 2.6