http://www.peachparts.com/shopforum/showthread.php?t=105144

The above link is a discussion about blow by and its relation to the engine condition.

Here is what my diesel MB mechanic said about blow by specs:

Acceptable new engine specs are 24 liters per minute.
50 liters per minute is a caution
He has had cars with 70 liters per minute that will still start.

Go find a used home gas meter, plumb it up and measure.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)