Well I'm sure there is a way to quantify it but the gallon baggie test might not be the way to go. My car would fill that bag in less than 2 seconds. It huffs pretty good in a nice rythmic fashion when I remove the oil cap, engine hot at idle. I've heard thats not a good sign yet I get 26 mpg on average, engine doesn't leak a drop of oil at any time, acceleration is excellent, and it starts within 2 seconds of cranking every time. By the standards of the blowby test one might consider this engine very tired yet I can't see how that is possible at only 169,000 miles and such a strong runner.

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Orland Park, IL
1985 300SD 215,000 miles