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73' 450se best spark plugs

Started by Rob Smith, 11 June 2023, 12:32 PM

Rob Smith

Been trying to figure out what the best spark plugs for my 200,000+ miles 73' 450se. I favor Bosch but would like some input.


Rob Smith


I think a lot of us use either NGK BP5ES or BP6ES
I do too, but can't remember which ones at this point...

Maybe that's a testament to their quality/longevity.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE


We use NGK BP6ES on all our cars, except for the w124, which get NGK BP6EFS. Never had any issues with them
1971 R107 350 SL
1972 W108 280 SEL 3.5
1975 W116 280 S
1975 W116 450 SEL 6.9 #140
1977 W123 230
1992 W124 230 CE
2001 Ducati Monster S4

Rob Smith

Jan S

NGK BP6ES on my 6.9 (US-version). Works great.
1975-mod W116 450 SE with 6.9 engine


If you favor Bosch, you can still buy the correct non resistor Bosch plugs from Mercedes. 
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo