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Unless you're an author or publisher selling books on amazon, mobi is an old and less capable format and best avoided. So azw3 is what you want to convert those epubs to. My experience is that if the book specifies fonts in its CSS then you won't be able to change them on the fly with your ereader (Oasis).
For example, using a recent book uploaded to the library here, pulpmeister's Carnacki the Ghostfinder - William Hope Hodgson.epub, in its CSS there are lines
font-family: "Calibri", "sans-serif";
Just delete the entire line and after you've deleted them and saved the epub then convert it to azw3 and it should then let you change the font in your ereader.
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