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Take it for a longer ride (45 minutes or more if possible) once a week at least. You want to get it thoroughly up temperature and get all water out of the oil (yes, water condenses inside the engine and adds to the oil, even if you have not experienced a rain event). At 6 miles, your engine likely isn't coming completely up to temp uniformly.
I have a thermobob on my cooling system and it does help significantly. However, you'll be okay with just taking a long ride once in a while. Personally, I used to have a 6 mile commute and I made sure to take the short way to work so I wasn't late, then take the longer way home to make sure it got warmed up completely each day. But to each his own.
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