[Shop-talk] oil vent mess

[Randall]

> Other option is you've got excessive blow by that's overwhelming the
> PCV
> system.  That would seem unlikely on an engine with 5000 miles, unless
> you've got stuck piston rings or something else major wrong causing
> lots of
> combustion gas to get in the crankcase.

I agree entirely, except about the likelihood of having "excess" blowby.
Those old PCV designs didn't allow for very much, and it would be very easy
IMO for a 40 year old motor to have stuck rings or rusty cylinder walls, no
matter how few miles it has been driven.  It is also normal for them to flow
backwards through the PCV intake, when the throttle is wide open (no
manifold vacuum to pull anything through the PCV valve).

My 65 Olds got to be pretty well worn towards the end of its life.  The
engine still ran fine, but if you held the throttle open for very long, it
would blow literally quarts of oil out the PCV intake.  From a standing
start with a full crankcase, it would be low on oil by the time it got to
100 mph.

-- Randall