Quote:
Originally Posted by S-Class Guru
Other than somewhat increased emissions, a non-working EGR will increase the engine's tendency to ping under partial load. Before I replaced my faulty unit, I couldn't run anything but preminum in my M103. With a properly functioning EGR, I can now run regular on the hottest days and have absolutely no hint of ping.
DG
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All is true, but, the knock sensor will hear the pinging and you will not. It will retard the timing to prevent more pinging, and that lowers HP, and fuel economy.
Mercedes knows this, and thus recommends premium fuel for best HPs and economy.