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      05-06-2007, 12:23 PM   #3
Brigadier General

Drives: '17 M2
Join Date: Mar 2007
Location: Atlanta

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Originally Posted by poiney View Post
The OM states that for 328i, it is safe to run regular unleaded gas since the ignition will adjust timing to avoid knocking.
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.