It's usually recommended to change the oil at least once a year, or 12000 miles, which ever comes first.
I'm sure Sooty will put me right if he feels differently.
It's very short journeys, one where the engine, exhaust and so on doesn't get a chance to warm up, that is the most damaging to a car. I think you do a 26 mile round trip for the school run, which is fine.
Incidentally, the recommended oil change interval in Houston was 3000 miles due to the adverse conditions.
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