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Mine popped out because I blocked an oil drain in the cam cover with sealant. I was replacing the solenoid on the right rear of the engine.
My guess would be that something is restricting the oil drain. Don't know about a bad AOS.
Sure does make a mess, tho.
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2001 Boxster
2007 Toyota Highlander
2003 New Beetle Convertible, Turbo, Tip 6 speed 
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