Ok, so I tried my hardest to see if this was a fixed issue on here, and on google, but hadn't found anything. My mazda6 is losing about a quart a week, and puts out HUGE clouds on the highway (high rpm). The breather hose on the valve cover isn't fully connected, and not sure if that is the issue, or if the PCV/oil separator is bad. Next to the separator, the head is hairline-cracked leaking the oil. Obviously Im looking for the cheapest and most straightforward fix, just need to know which part to go for first. My guess would be the breather hose connection (should this rattle like the PCV valve?). Or go ahead and tear-down the intake and see if its the PCV issue. Or maybe even piston rings (looks like a salvaged engine was put in here). Im just shorthanded at college without a place to work on it and need to drive it to work and school everyday. Thanks in advance for the help.