> ..As some people on the list have noticed (Kaleb for one), the mid-'80s > Mercedes engines that supposedly require premium---the M103 in the > 300E, for instance---run just fine on regular, so they are apparently > sophisticated enough to retard their timing correctly to avoid knock. > Not on that car which had a conventional ignition system. The M104 was a Motronic engine with knock sensors. And the high speed detonation which will hole a piston in an instant is never heard before it's over. I've seen a few melted early Porsche pistons which gets very expensive.
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