the original spark plugs died (delphi) so i changed them for Bosch ones
Plugs(Denso IK22) coils(DENSO or Hitachi) and a valve adjustment, all due at 100k. They really do make them run better and much more reliably.
We used to put Bosch W7DTC spark plugs in them. No gapping required, smoother idle, and they last 60k miles, maybe more.
You can get NGK or Bosch plugs on rockauto for around $10. Not sure which was OEM, some like NGK for Mercedes in general but Bosch tends to be the OEM maker of plugs for MB.
I recently changed my spark plugs on 2012 Ford Focus. I used Bosch and got a 3 MPG boost.
I installed Denso a few weeks ago.
Since I mounted Bosch 4-prong spark plugs, fuel economy has improved a lot. Gone from 12-13 km/l to nearly 15 km/l.
Just an update for you and a PSA: CHECK YOUR SPARK PLUG GAP ON NEW PLUGS. I too trusted that the iridium plugs that I just bought should've been pre-gapped, but I noticed immediately after a tune-up my gas mileage went to piss. Popped the plugs back out and sure enough each one was well over 1mm .
the plugs are brand new Bosch Double Platinum.... so then I went out, put them back in and was still a biotch to start....
the tips of the IKH24s break off in expensive TTRS engines.
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