C36 after 100K..
my 190DT just started calming down and feeling more potent at 290K miles, so yes - that M104 should just be breaking in about now!

Don't worry about your M113 block wearing out. An aluminum block with aluminum heads mean the head gasket will last longer. For those that don't know, aluminum expands and contracts over 50% faster than iron. With an iron block and aluminum head, each engine heat cycle results in the head gasket being scrubbed a little. Also, the M113 cylinders are Alusil. Alusil cylinders can be damaged by using crap for oil or by ingesting something hard (either of which will kill any cylinder), but normal wear usually is not a problem. Your M113 block will last at very long time.
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