Quote:
Originally Posted by poiney
The OM states that for 328i, it is safe to run regular unleaded gas since the ignition will adjust timing to avoid knocking.
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The 13B-REW Rotary engines I was working with would eventually blow up due to weakened apex seals if there were only a
few ping events. So to be on the safe side, we would do things like always run it a little rich, to help avoid the pinging in the first place.
But regardless of the engine, detonation due to pre-ignition will drastically shorten its life. It seems that a properly tuned engine would not even need to rely on the knock sensor - after all, it's only supposed to be a
back-up system in the rare events something goes wrong. I am surprised that your owners manual states that.