worth it to have it done at least once a year, preferably in the off season (spring through early fall).
there's a lot of sludge in #2 heating oil to start with, and it just builds up in the tank, where it mingles with moisture and bacterial digestion. there are fuel additives that can thin it out, but it all builds up on the nozzles and filters.
cheaper to have a preventative cleaning than an emergent service call in the dead of winter at 2 a.m. the latter might cost a you a bit.
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