Blow by to me is when the rings get weak (or cylinder taper to large) that the exhaust gases can escape past the rings. It causes more positive pressure inside the engine than what the PCV system can handle. In the past (long past I might add), some seepage was expected and the PCV system accomodated it at the benefit of reduced NOX at the tail pipe.

Check around the oil dipstick because if you are getting alot of pressure it will push oil past the o-ring of the dip stick and coat the outside top of the dipstick.

Only solution I'm aware of if is a lower end rebuild (rings/re hone cylinder to remove taper) I'm afraid.

I'm really not an expert on this area so hopefully someone will chirp in and correct any errors I've said.

Ron.

PS. I wrecked an 89 Volvo because I couldn't get the oil seperator to cut down on its weeping. Figured it was blowby. Didn't bother me much because I only paid $2k for the car and drove it for over 2 years.

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1995 E320 -171k-km
1995 S420 -333k-km