Engine oil cap

My 2014 CX-5 engine oil cap is so tight that I cannot open it by hand or a wrench. Do you have any suggestion other than bringing my car to the dealer? The car has just gone thru an oil change at the dealer.
 
If you just had it to the dealer for an oil change then I would take it back and have them deal with the stuck cap. Chances are their oil jockey cross threaded it.
 
Went to dealer. After turning anti clockwise for half a turn, you need to pull the cap upwards. It is easier if you remove (pull up) the plastic engine cover first.
 
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