I have always driven at least 20 or more miles to get to work - one way. I am using Amsoil and take advantage of extended drains. Getting the engine up to operating temp was never an issue. Now, I will be starting a new job soon and will only be driving 3 miles or less to work. I live in an area that has very cold temps in the winter (I don't think we have hit anything above 15F in the last 2 weeks) and gets about 20 days above 90F in the summer. I will be doing a 20 mile drive (one way) at least twice a week. Needless to say, I doubt I will hit 1,000 miles per month. Now, the question. Can I change to a 1 year OCI with a new filter at 6 months and still be safe, or should I do something else?