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I have a 2009 Chevy Malibu LS 2.4 ECOTECH automatic 164xxx miles I've stayed up on my oil changes. I don't typically take it to a shop for anything. So, I kept forgetting to check my oil. Idiot, I know. When I did, it read empty. All I had was nearly 2 quarts, but I put all of it in. After day 2 I figured before I start my errands, I ought to check it. I was floored. I cleaned it off really good and checked again. It was BEYOND full. HOW???! It has some other issues..IF ANYONE CAN EXPLAIN THIS PLEASE..'Cause idk how it's possible other than if the tube part of the dipstick is somehow moving. There's also been a couple other things I've found peculiar. I'll attach a pic from when I replaced the valve gasket. It's also been doing some whistling air type sound recently.
 

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2011 Malibu LTZ 3.6L V6 Red Jewel Tintcoat
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Maybe the dipstick wasn't all the way down, either due to gallery pressure pushing it up or from some kind of obstruction when inserting the last time.

Oil doesn't get stored like some folks think camels store water (in their humps), and then reappear. It was always there. You would be wise to drain off the excess or it could start blowing out seals, and then you'll be in a bigger mess.
 

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Clean oil is often difficult to see on the dipstick. When checking oil try to always do it while parked in the same level spot. Parking nose down will increase the oil level reading. Parking uphill willl decrease the oil level reading. If the oil is now greater than 1/2 inch above the full mark, I would suggest you drain or siphon some oil from the engine.

The valve cover removed photo.... Dark deposits on the driver's end of the head appears to show the PCV system is not working as well as it should be.

A guess....some versions of this engine are known to collect ice in the PCV hose and intake resonance chamber attached to the intake plenum.. This could obstruct air flow in the PCV system and cause a whistle? Even if you live in a warm climate, I would still examine these items.
 
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