So, what I thought might have been a blocked PCV vent system is worse than I thought. Checked all 5 cyl compressions and I'm all over the place.
I44,122,80,74,100. Could this just be a blown HGasket or blown engine? Only 60K miles. Initially started chasing down erratic idle and excessive positive crankcase pressure thinking it was a plugged Vent system. Wouldn't a blown HG show just maybe adjacent cylinders low? Could use some advise here. Looks like blowby but with only 60k I would think the block would be ok. 2010-S40. Thanks

Adding oil doesn't bump them much maybe 10 psi there are no other telltale signs of smoke, vapors, milky oil or overheating. Just blowby symptoms and erratic idle.

 

I'd also think if you had a blown head gasket you'd get oil in the coolant or HCs in the coolant. You can buy an HC coolant test kit for about $30 to see if any combustion gases are reaching the coolant - typical of a blown head gasket.

Your numbers are all over the place, and only one suggests a normal reading - so I'd also do a retest with a different gauge (If you didn't use a quality gauge, you can probably rent a pro quality one at a big autoparts). Did you do the test with a hot or cold engine?

 

And don't forget the throttle has to be wide open while cranking. Hopefully the Electronic Throttle Control allows wide open throttle while cranking.