And you mechanic made this diagnosis based on what?? .. a compression check I hope. If so what were the numbers from that test. Every engine has an amount of blow-by. The PCV system helps to scavange this from the crankcase and add it to the air going into the coombustion chamber to be burned. Its a ventilation system for the crankcase, hense the name PCV or positive crankcase ventilation valve. Check the PCV with the engine running and make sure it is pulling a vacuum. If not, you need to determine where the blockage is. It could be a clogged PCV valve or sometimes the the hose will clog at the inlet to the manifold or throttle body. This passageway needs to be clear so that there is airflow. If your PCV system is working properly when you check it then you need to have a compression check done on the engine to determine the condition of the engine. You warm up the engine then shut down and pull all the spark plugs. Then each cylinder at a time you install the compression gauge and crank the engine over untill the gauge reads its highest value, usually several cranks will do. After you get a reading on one cylinder, remove the compression gauge and squirt in a cople of shots of oil. Then repeat the test. The idea is the fresh oil in the cylinder will momentatily seal worn piston rings and you'll see a marked increase in the results. If numbers were low and no increase then this would indicate a burnt valve. There are other things the results help you indetify also, like all the numbers should be near the same and you can compare them to manufacturers specs to determine how worn they are. Also if two cylinders next to each other are low this indicates a blown head gasket between them. Sorry to run on here but a compression check results will help you to determine where the engine stands and you can then make a more informed decision. Good luck.
x2, just saved me from typing all that out! You can also check the crank breather and intake piping and see if it is wet with oil, as often times on many cars with worn rings there is so much blowby that oil is forced through the breather pipe into the intake. If you clean it out it will simply happen again.
From the symtoms you describe it doesnt sound to me like your rings are worn. You would see bluish smoke and be able to smell it, and you'd need to be adding oil. Since you havent had to add oil I think you should be alright. If oil was being burned and excessive gasoline was leaking past the rings and mixing with the oil I think you'd know it, the oil would become very thin and likely burn better than straight motor oil.
As said, a certain amount of blowby is normal, it happens with all engines. I would do a compression check and if all the cylinders are within reasonable limits and they are all within about 10 psi of each other then you should be fine.
I personally would have never diagnosed worn rings with the rest of those symptoms. If the mechanic is correct then there must be something he knows that we don't. I've been through that job before. Not particularly fun tbh!
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