Oil change interval with low mileage

I did try to search for this topic, but was not able to find one that relates to my situation. I have a few cars and am retired, I don't put many miles on any one car. At most, I post mileage of about 3000 miles per year. At this point I have been changing the oil every year with Amsoil synthetic oils, no matter the mileage (as mentioned, never over 3000 miles). Most of my mileage is highway, probably about 80% highway. The recommended manufacture OCI varies from 6 months to 1 year with...

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