Why not? Just because you don't do it why can't someone else? Changing the engine oil more often than what the manufacturer specifies is doing absolutely no harm whatsoever. I have always done 6 month intervals on my cars and it gives me piece of mind to know that the engine has clean good quality oil in it, and gives me pleasure because i like working on my cars and it gives me the opportunity to have a look around the engine bay and make sure i have no leaks, worn out belts etc etc.
It's like saying why do some people have 2 showers per day when you only really need to have 1.
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