Cooker,
I have lots of Optimas, about 4 blue-tops and about 4 yellow-tops.
My oldest ones are a pair of yellow-tops that I installed in my 1995 truck in 1997. They are showing their age, but still working. I would trust them in a truck that was started a couple of times each week, but the 1995 doesn't get driven that often. As long as they are charged occasionally, I think that they would start either of my trucks in our mild, southern Indiana winter. (Low temperatures usually no lower than 0-10F. ) I am currently using them as the house batteries in our Airstream travel trailer.
I will be very interested to see how long they last.
I install the newest batteries in my 2000 truck, the second newest in the 1995 truck. After that, I either use them in the trailer, or split up the pair and use them individually in other vehicles.
I do take care of my batteries, charging with a sophisticated Vector charger when I think they need it, and reconditioning them with a BatteryMINDer occasionally. I don't know if all this does any good or not. I haven't experimented with any batteries that have not gotten this treatment.
Loren