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Regarding the low mileage, but extended time interval issue;
My belief is that although car manufacturers give both a mileage and time limit to change the oil, the time does not really matter, and is irrelevant. Oil does not degrade by just sitting there and not being run in an engine. As long as it is changed within the mileage limit then that if fine, irrespective of the time. There is in fact, only one reason oil can degrade in a condition of not being run in an engine, and that is moisture absorption from condensation. When I recently changed my oil the mileage was 5723 miles between changes, less than the 7500 miles limit, but the time was almost 2 years, not the 6 months stated. To prove my point I sent the used oil to a lab for testing and the results confirmed my theory, my oil has 0.0% water content. I might add that in certain parts of the country, condensation may be a bigger problem and extended time may not work.
Cheers,
Michael
 

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+1 - here is mine showing no moisture after 2 years.
Cheers,
Michael
I've used Blackstone Labs before and they're very easy to use. You can order a free collection kit online and next interval, just take some from the middle of the drain and send it back in the kit.
They'll take a look at the oil chemically not visually (which doesn't mean anything) and w/ a TBN, give you an idea of how long you can run the car for on the oil. Without that, you're just guessing, in my opinion.
 

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