engine problems
 

I have a problem with my 2006 Cobalt SS non-supercharged. After I got some service done at the dealer I noticed my engine started bogging and ticking and clunking. It also has blow back when you take the oil cap off and some oil sprays out. I tried getting the dealer to look at it, but they said it was normal because it doesn't have a PCV valve.

Can someone help me narrow down what the problem is?

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Try another dealer? :dunno:

Theres no pcv valve? wtf? how is the crankcase pressure supposed to escape?