PCV Tube: I did take off the tube and the elbow and blow on one end and felt the air easily on the other. I didn't blow hard, in my opinion there's zero restriction in either.

Overfilled with oil: Possible my dipstick could be off, but I'm surprised that would cause ALL the oil to blow out.

Oil Filter Collapse: I might be overstating this and misleading. Looking up the middle of the filter the top portion wasn't perfectly cylinderical anymore. The walls still had integrity, but not it's original shape.

I do certainly think it's possible that something, a washer, O-Ring, etc got dropped in my oil filter housing at some point and who knows where this has gone. I say this because I did a couple of filter changes before I realized "Hey there's an O-Ring there."

I think I'm going to remove my dipstick and hook up a vacuum / pressure gauge tonight to the dipstick tube. Then I'll drive it to work in the morning and see what happens. I'll get readings that might coincide with the low oil indicator light. I'm just worried that I'm harming my engine driving it under this condition.

Bill

__________________
'87 300SDL, intensely modified Greasecar setup, with nickle plated heat exchanger, 3 valve setup, 312,000 miles
'95 Suburban diesel, Greasecar basics, 16 plate heat exchanger, mercedes fuel lines, Racor filter
'85 Renault Alliance converted full electric vehicle