M104.980 motor - any quick recommendations? I have read, and read, and read...

Bosch F 9 DCO listed in manual and it has Bosch F8DC4 in it now. I haven't been real pleased with how the car has run since I got it, so I was thinking of trying something else (current plugs need changed).

Some links indicate NGK BP5ES, some NGK BP4ES or BP6ES, and I've run across NGK BCP5ES...

Any suggestions?

ryan

__________________
RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE