I've had my Bosch platinum spark plugs in for 120k+ kilometers and they still run as good as they did the day I installed them, back in 2011.
the original spark plugs died (delphi) so i changed them for Bosch ones
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 have never seen any real large difference in NGK, Denso, and Champion if the proper heat range/type plug was used.
I'm not a fan of the old platinum Bosch design or regular autolite.
Autolite plugs are bad.
Do yourself a favor and throw Autolite plugs in the garbage.
Those spark plugs are junk, and on top of that, they are now carbon fouled. I would strongly encourage you to install new, normal, spark plugs.
I ended up checking the ignition timing again, put in a new coil, new knock sensors, put in another fresh set of plugs, set the DPR MA to +5, and I failed my emissions test with the same results.
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