Air blowing out oil fill cap

[Happyshappp]

I just bought a 2008 pontiac g6 base with 107,000 miles. The engine seems to have a exhaust noise. I was looking under the hood and removed the oil cap, yes with the car running and it sounded like air moving thru a fan blade and had so much air blowing thru oil fill cap , it was spitting oil out fill cap. Took back to used car lot I bought it from and was told normal. Have never seen that much air in a engine before please new to this would like some help

 

[92 Sunbird LE]

Had a couple of cars do that , broken rings or hole in a piston was what mine had.

Doug in P.R.

 

[melsg5]

i have absolutely no issues with my 2008 G6 with the 2.4 4 cylinder engine and just tried removing the cap. It does the exact same thing. you have a crankshaft spinning, you have pistons and connecting rods moving up and down, you have a camshaft spinning and rocker arms moving. It sounds like an airplane rrrrrrrrrrrrrrrr is the best comparison I can come up with. If you have an exhaust noise which you feel should not be there take the vehicle to another shop.