Oil life?? Time vs. mileage ....

I agree with bighammer, EXCEPT that you specifically gave a very low amount of miles in a long period. Not being driven that much gives moisture and contaminants a chance to take a foothold on your oil. Being driven on a regular basis up to operating temperature is what makes oil last. The proper operating temperature is a must to help boil out all of the contamination that gets into oil. The less you drive it, the more you should change the oil. That's just my opinion and I am stickin with it.