The only issue I've heard with using mineral oil is the fact that it will dissolve some PCBs over time. I don't put too much credit to this because I've never heard about this actually happening. I've never heard about any problem with capacitors so I wouldn't give them any specail treatment. As for mosfets they like it cool. In fact as they heat up they output more heat because resistance increases. The Max3 series actually cools the mosfets.
The one thing you should keep in mind, and its in the picture, is to use standoffs under the board. Overtime water can condense and form 'bubbles' on the bottom of your system, the standoffs will prevent those bubbles from shorting your board.
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