I have a 2003 CLK55 on around 125k miles.

The car runs well and gives up to 25 MPG on a cruise. Slightly shaky idle (less than 100 RPM variation) but otherwise fine. No fault codes.

I’ve pulled a plug and the cylinder is burning cleanly but it is due to be replaced, so I have 16 Bosch R6 double platinum spark plugs coming.

At this stage my plan is to keep the wires. That said, if I hit any issues I will obviously replace.

However, a cheap set of wires is £60 and the most expensive I can see are £400. Big difference.

Long story short...
What is everybody using and what is the OEM option? I thought perhaps Beru or Bremi.

For the benefit of others, I went with Beru wires in the end. ZEF1488 was the part number. These sell for upwards of £200 in the UK.

Quality was very good and they fit with no issues at all.

Combined with new plugs there was a noticeable improvement to running.

Magnecor