Oil change on oil burner

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In my old K1500, I change the filter twice a year (Napa Gold) and run my truck about 10k miles a year. She burns a quart every 600-800 miles, so I change the plugs often, and the oil never.
 
I have no idea why some people would not drain the oil once a year and change it.

Oil is 12 dollars a jug, even if you have an oil burner drain it once a year and start again.
 
I would use a 10W-40 high mileage oil in winter, then maybe start using 15W-40 when it warms up and change it at least once a year with a good filter...
 
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