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2009 C300 RPM Fluctuation, Grind & vibration from the rear wheel drivetrain.
For approx 30k miles I experienced what some would describe as a Misfire or a power Surgea in my 2009 Mercedes Benz C300. I made several trips between multiple dealerships and Mercedes Certified Mechanics until I was able to find the solution. Ive also looked on youtube in hopes for somebody to have this same problem which I never was able to find. So i made this video to help other people who may be frustrated with this very same ongoing problem.
What I forgot to mention in this video was the fact that this fix also got rid of a rear grind noise and vibration that i would hear and feel periodically in between almost every other few random times the car shifted gears. Although that problem begun maybe 10k miles before the misfire problem. I assumed I had a problem with my differential or transmission.
UPDATED NOTE: You will need to have the fluid changed again every 30k to 40k miles thereafter. When you notice the problem coming back all over again that is when it will be time to have it changed out. So far I have had to do this twice now and both times it has fixed my problem.