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I read in the manual that they grease parts in your car when they do maintance. What parts do they grease and what kinda grease do you use?

 
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WD40 on all hinges.

 
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Don't ever use WD-40 on the hinges, you should use a lithium based grease. WD-40 is a "water displacing" oil and a penitrate, though it won't hurt your hinges its just that it won't last long. I think the manual has the exact type of grease to use, but a "white lithium" from any parts store will work. Just apply it with a small brush, a small model car paint brush works well, it lets you get into the hinges well.