6.3

Attention Patrick:

I just double checked on the badge of NGK BP5ES that I recently received: They do have a threaded terminal and thus the nuts are removable.

On the plug itself there is no information telling if this is a particular type of BP5ES but on the small paper cartridge box it says: "Removable" and "6511" and "BP5ES".

So maybe you were unlucky receiving another variant of the BP5ES with fixed terminals.

109.018.12 1968 Bronze Braun (M100 in good shape)

126.039.1A 1988 Dunkelblau (M117 so a bit slower)

+ A few other MBs used for daily transport

I too drive a Euro spec M100 engine from 1969.

My plugs are Champion N11YCC, equivalent to Bosch W8 DCO. The MB parts catalogue terms these as "city traffic" meaning they are not suited for longtime Autobahn driving.

In case you drive mostly at higher speeds, the recommendation is Champion N9YCC or Bosch W7 DCO. The NGK replacement for these seems to be BP6ES.

109.018.12 1968 Bronze Braun (M100 in good shape)

126.039.1A 1988 Dunkelblau (M117 so a bit slower)

+ A few other MBs used for daily transport

Asking the same questions, I looked up NGK Spark Plugs in the interweb. NGK has a home page that directs you to spark plugs. Within that page is a reference to a table that lists the possibilities. The columns are: electrode, shell, resistor, heat range, firing end construction, and, gap. So, B is the electrode. P is the dimension thread and reach. 5 is the heat range, E is the firing end construction. S specifies the gap from the factory. Lower number heat range is hotter; higher number hear range is cooler. String the letters and numbers and you have the plug you want. I was unable to find a BP4ES on the web.

Hello.

I'm based in EU and I'm using Brisk 1313 spark plugs for years. It's an equivalent of Bosch WR 7 DC (0 242 235 663).

You may go for more expensive Bosch WR 78 (0 242 232 504).

My car is European spec 1969 with high compression. My rule is to use cheap and basic sparkplugs and change them often.

600 #796 (1967 US version)

300SEL 6.3 #1285 (1969 EURO version)

300SEL 6.3 #5346 (1971 US version project)

Well, I just wasted money on 16 new NGK BP5ES spark plugs that have a permanent terminal end.My 6.3 is #870 and the BP6ES' don't burn quite hot enough and wanted a hotter plug. Any suggestions?