spark plugs 250 sl

[rmmchl]

what are the correct plugs and gap

[Raymond]

Bosch W7DC .9 mm (.035 in) is the short answer.

Do a search for Spark Plugs.  There is about everything you could want to know about the plugs for these cars.

Ray
'68 280SL 4-spd Coupe

[Benz Dr.]

I won't use W7DC - they're too cold on all but the best engines. This plug was intended for when the engine was new and doesn't work well on rich running or lower compression engines. I use W9DC0 for everything these days.

Dan Caron's
 SL Barn
benzbarn@ebtech.net
 slbarn.mbz.org
  1 877 661 6061

[66andBlue]

Hi Dan,
what is the difference between a W9DCo and a W9DC?

Alfred
1966 blue 230SL automatic

[Richard Madison]

Perhaps this Spark Plug nomenclature chart will be helpful.

Richard M

Download Attachment: sparkplug.jpg
45.7 KB

[Bob G ✝︎]

What plug is the equivlant in the NKG line for a 280SL with 90,000 miles?

Bob Geco

[66andBlue]

quote:Originally posted by 280SL71

Perhaps this Spark Plug nomenclature chart will be helpful.

Thanks Richard.
It is quite helpful - now I know that the "zero" stands for "special shell or electrode" - but perhaps what I should have asked the good doctor was why the difference between a W9DC ad a W9DC0 is significant and/or important.

Alfred
1966 blue 230SL automatic