2017 CX3 2.0 67,000 miles - Oil Filter came loose lost all oil possible PCV stuck issue?

Background: Daughter calls with engine light on after driving 15 minutes or so to work...turns out the oil filter leaked and lost all of the oil the morning after a return from a 3 hour trip. I put a new oil filter on, added oil, no leaks; red light went off, yellow light turned off during test drive, the car drives and sounds fine. With the oil cap off and the car running, there seems to be a lot of air / oil spray coming out of the oil cap which leads me to believe there is excess pressure and could be the PCV VALVE or is this normal on this engine? The last oil change was around 6 months and 5,000 miles ago (until this forced one) so, no, the oil had not been recently change. Looking for some advice, my 2 theories are: 1. The filter just came loose after the trip, maybe it was never tightened, fully and the blow out of the open oil fill is normal or 2. A stuck PCV valve caused increase pressure making the oil filter leak which would be corroborated with what I believe is excess pressure in the engine.
The valve is behind the intake manifold which has to be removed. I took it what I thought was an honest shop, thought they could diagnose and told them I suspected the PVC valve, they quoted $1600!!!!! Called a dealer and they quoted $556 plus tax to replace a PCV valve. Needless to say, I'm picking it up at the "honest" shop, but want to know if anyone has any experience / knowledge on this, my research leads me to believe that PCV valve failure at 67,000 miles isn't that normal... Thanks!

 

The engine system is pressurized, and it is 100% normal to get oil and air when you remove the oil cap.

I would post a video but I am not going to mess my engine up to prove it!

Count yourself lucky that you did not do engine damage!

If the PCV is faulty you would get a DTC or the engine would idle poorly ,MPG would go down very notable the sound of the engine would sound labore.
ets, ets , ets.
If the PCV was in fact plugged you would also very distinctly hear a hissing sound right after the engine was shut off. That would be the crankcase pressure bleeding off in the breather side of the PCV system
That shop you went to IMHO find another shop based on your response they either do not know what they are doing or see a "mark" to get as much $$$ from them.

I might add that while not 100% never happened the amount of pressure to cause damage to a spin on oil filter would have to exceed 150?bls oil pressure. never going to happen in your Mazda engine.
Some on dropped the ball at the last oil and filter service and neglected to tighten the oil filter! IMHO!!!!

 

Welcome to the forum

 

The lucky thing to make note for all reading this thread while an engine can be damaged by losing all the sumps oil the good news if the oil was fully synthetic or a blend the oil film that remains for a short time will effectively protect contact and reciprocating parts for a short time period. This can range from a few minutes to even much longer before irreputable engine damage might occur. This is why changing your oil and filter at shorter intervals then the recommend by the OE may be an insurance that should this rare oil loss happen you may save you engine and costly repairs?

ASE

 

So I just went and took these pictures and even a 16 second video

 

NOTE: my engine is completely cold, and this was the first time starting it today. If you look you will see the air pressure and the oil droplets being blown out of the oil cap area.
This is NORAMAL for most all gasoline modern engines from at least 2000 to present.
Some even notice that removing my oil cap may seem harder than most and that is because I not only replace the O-ring on the cap every oil and filter service but use a larger diameter(fatter) O-ring for a firmer fit.

 

Thanks and for the great information!

 

This video is exactly what I needed to know, I appreciate and now know this is indeed normal!

 

Thanks again for the info, it was a big help! Did you recently change out an intake ?

 

extremely lucky, I think she drove it for 15-20 minutes in town, and at this point there isn't any evidence, of engine damage. We do run full synthetic oil, and I agree there was probably enough residual oil around in the motor for some limited lubrication. Probably advanced a little engine wear, but got lucky nothing like you say irrefutable. My guess is the last guy that changed the oil probably "under" hand tightened over 6 months it slightly loosened through heat cycles, I put the new one one as tight as I could get it with my bare hands, how tight should it be?