So can someone tell me what is considered lots of blowby?
I just picked up a 123 300D and when I pull the oil filler I get a light cloud of vapors rising out of the filler opening. It kind of reminds me of an old steam locomotive but without the heavy chug, chug. More like when it is at rest at a stop.
It definitely is less than my 240 which sounds like a constant brrrrrrrrrrrrrrrrrr sound when I pull the cap.
What is considered normal or reasonable for blowby?

I tried a little test this morning. 16 degrees and I went out, put the key in the new car and did not allow the GPs to cycle but instead just turned the key to start.
Rotated for about 6 seconds and then it caught and fired on all cylinders. 1/4 throttle.
I think this is good, yes? I ask because I have a rough spot just above idle when in gear aned low power but apparently high compression. I know it might be one bad hole but this usually would show up in the blowby test wouldn't it? Also when I crack each injector line they all seem to make teh engine really go rough. I would thin that if it were one bad hole that the engine would not change significantly when that injector line was cracked. At least I guess this means that all cylinders are helping...
This one is going to drive me nuts I'm sure...

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique