I got these...

Weistec M157 / M278 spark plugs are designed and manufactured for not only high power applications but also factory replacement. The factory iridium plugs do not handle the M157’s high cylinder pressures very well due to the very small electrode tip and frequently result in misfire problems, even on unmodified vehicles.

Our silver core BOSCH spark plugs can support significant increases in power while operating perfectly under normal driving situations. The M157 / M278 spark plugs are also 1 step colder to help prevent pre-ignition in engines that are making more power than stock allowing you to further push the envelope of your vehicle.

KEY FEATURES:
Higher Output for High Boost Applications

Colder range for better performance with increased horsepower levels

Direct replacement / bolt in for M157 / M278 engines

Silver core spark plug provides significantly improved performance over iridium

Suitable for all M157 / M278 vehicles from stock to highly modified

Set of 8

I am not a buyer for any of the automotives but with that being said. .. I am guessing that who ever meets the MB specifications for quality, reliabilty and application needs at the best price gets the business from MB. I can't imagine that a Bosch plug would be a bad choice.

MB has been using bosch for sometime till they changed to NGK. not sure why but your reason seems right on the money.

but imo, for a few dollars more id rather go for bosch. i believe theres no difference or not much, if theres any, if you stay with the correct specs between bosch and ngk, its probably just the brand name for me. :y euro car, euro parts. although everything nowadays is made in china.:rolf:

Are the gaps the same for the E350 and the E550? I have an E350 4MATIC, and plan on changing my spark plugs this weekend. Do I still use the .032 gap with 23nm tightening torque? Please let me know if it should be any different! Thanks MBWorld forums!!

According to the owners manual (at least for the 2010 models), the Gap is the same for both cars (.031 in)
https://cimg3.ibsrv.net/gimg/www.mbw...7daf82b392.png
https://cimg7.ibsrv.net/gimg/www.mbw...e22d5ac000.png

Thank you pb39374! Much appreciated!!! =)

I forgot which ones but I used Bosch Platinum on my 2011 E350 and no problems. Gap was set right out of the box and fairly straight forward R/R. highly recommend Magnetic screwdriver especially on the Coil pack retaining Torx I dropped three down the abyss of the side of the engine never to be seen again. Went to dealer I needed three but they had 13 in stock. I wiped them out to be on the safe side. Personally I think some of the modern day lifespans are over estimated and remember they are baking on you being way out of warranty before a major component fails. I personally would be replacing the plugs every 50K at most even if they were good. Simple Logic....Remove and prevent from seizing in the block. Too many horror stories about the Ford V8 and plugs stripping out or breaking off in the head.

Thank you for the insight!! Mucho apprecianado!!! If that's even a real word..... 🤔😁

when you state to gap at 0.032 is that in standard?