1994 Turbo 850 wagon, 201K miles averaging 5K miles per year. PVC system replaced 40K miles ago. Oil changed every 5K miles using Mobil-1 synthetic with prior “Motor Flush."

Just paid for new rear mail seal and now see leaking oil out of passenger cam seals, maybe quarter teaspoon when parked overnight. No engine codes, no oil burning, car runs well.

I remove the oil cap and attach a 5mm latex glove over the opening. At idle there’s not enough pressure to inflate the fingers; raising the throttle will slightly inflate the fingers then the fingers fall upon return to idle.

Does a properly running engine with good PVC system show a little positive crankcase pressure like mine?

I’ve got a $20 bottle of Bernie’s AT-205 ready to go into the crankcase…

 

It will inflate the glove if the PCV is bad.

 

So the crankcase should generally be under negative (slight vacuum) pressure?

 

Correct.
https://www.youtube.com/shorts/FOxfvzEFpYg

 

Perfect! Thx for the quick reply!

 

If you look at where the crankcase is vented to on a turbo, it's never going to see any significant vacuum. The intake does see pressure drop from the air filter, so there is a tiny tiny bit of suction applied. If the engine is absolutely perfect, you could get the pressure down to zero. Not easy, though.

 

The previous video shows negative pressure (vacuum.). Will an older engine with a new PCV system show negative pressure?

 

Both of my 850R's do.

 

OK, looks like I need to replace the PCV... again.

I see three options, IPD aftermarket @ $111 which includes (3) hoses and the oil trap, FCP Euro (OEM) @ $387 which includes (6) hoses and the oil trap, RockAuto (URO) @ $84 which includes (3) hoses and the oil trap.

Will the (3) hose option be sufficient?