I meant to put in my agreement with Greg also. I would use machine oil or even just some of the standard engine loil for your car in preference to CRC 5.56/WD40 or similar products. They are thinner and will dry off quicker than a machine/engine oil but given what they are used for they may also disperse the existing engine oil as well and that could leave you worse off not better.
The worst you might get if you ladle in a bit much machine or engine oil is a car that blows smoke for a couple of minutes when you first fire it up again after returning.
As was posted above, if you can get someone to drive it about twice a month for 20 minutes or so it pretty well avoids all of these considerations and it helps keep things like brakes and exhaust systems from attracting moisture and deteriorating too.
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