Generally speaking, you're correct, however, the 1998 12 valve truck I am driving is a different scenario.
Very, very little blowby when idling, but blows oil out the vent and will blue smoke out the exhaust when I nail it hard, down the road.
It's all fine at idle and revving it, fires right up, even on 15* days, so it has compression.
Only thing I can think of causing it to do this is well-worn rings and guides.
Yet, it hazes very little out of the oil filler at idle.
I'll be glad when I finally tear that POS engine apart.
Mark.
Had a bad turbo on a truck I used to own, had about the same symptoms. Blew my mind a turbo would pump pressure into the crankcase.
Would idle perfect with zero blowby, but push the dipstick tube out after driving it.
