Would it make you feel better if you put an engine heater on it for use this winter? About 5 years ago I had an old 4.0 Jeep motor that was getting up there in miles. I cringed everytime I'd start it below freezing just because of the noises it made until it ran for a few seconds. So I spent $40 and had a block heater put on. When it would get really cold (lived in IA at the time so 0-degree weather isn't out of the question), I'd just plug it in. It was nice the next morning when it would start quietly and warm up quickly. It won't solve all your worries, but you could look at it as a move to restore some of the life you think the new schedule is taking out of the engine.