i have a 93 which was the original "e" with the M104 engine. digging through the records i got from the PO i discovered that the head gasket was "seeping" at 15k miles (they never had it re-checked). i replaced it 40k miles later at which time it had already turned into a gusher...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"