If its that hard to remove the oil filler cap you have a dead AOS. Replace the AOS and see what happens. When the membrane in the AOS splits, which yours already has done, you have a vacuum leak. fix the known problems first and then you can start working on the unknowns.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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