Julio, I once had an old Mitsubishi Colt with a lot of blowby. The PCV sytem froze up because of all the water vapor (for every gallon gas burned, you get a gallon of water) and the screwed oil cap stayed on tight. The result was that the CRANKSHAFT SEAL BLEW!!, and it cost $400 to fix it. In retrospect I should have scrapped the car.
So, I stand by my assessment; get a cylinder compression test and other inspections done. My father once drove his tractor for weeks with the oil cap off, and very little oil sprayed over the engine. But that engine was tight, with very little blowby. All engines have some blowby, but the PCV sytem is supposed to handle it.