Howdy y'all!

Here goes my rant over a 1993 Montero 3.0L 6G72 w/ approx 60K mi. swapped engine

Yesterday morning, before taking off, I decided to add 1 qt. of engine oil, since the day before I checked the level.

I twisted off the oil cap with the engine on (recently started), and saw a hint of white smoke coming from the oil opening, which I had seen many times before. When I poured in the oil, the new oil JUST SHOT UP INTO THE AIR. I'd never seen this happen! Is this normal?

I started thinking out my options:

1. Has the PCV valve died?
2. Piston rings starting to go? (haven't run a compression test)
3. Is this normal on a cold engine? (Piston rings haven't expanded yet, causing some normal blowback?)
4. This is normal lubrication system pressurizing in a cold engine...

Please, tell me nothing is wrong! I haven't had a loss in power, or oil leakage thru any gasket. She's running GREAT for the first time in years!!