Hey folks. Whats the best spark plug for a 1993 300ce Cabriolet, and are there any tips and advise on plugs and the ignition system?

Here's the standard answer: the best plug is the one that Mercedes specifies for that engine. According to the EPC, that's a Bosch F8DC4.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

I second that. Alot of people fall into the marketing trap of thinking their "expensive" European car needs some exotic plugs like Bosch Platinum, or double platinum, etc. Just use the good old cooper plugs specified by Benz. The Bosch plugs for my '94 coupe were something like $2.40 a piece, if I reember correctly. Ironically it's the plugs in my daughter's "economical" 2000 Toyota Celica that cost alot more. Spec for that car is Iridium plugs which were $8 a piece!!!!

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member

I use iridium because of the nitrous oxide,I can't have a plug misfire

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1999 w140, quit voting to old, and to old to fight, a god damned veteran