If you're changing your own oil flter, standard advice has been to pre-fill it with new oil. But is pre-filling your oil filter now outdated advice?

Air purifiers need filter replacements at regular intervals. Find out how often you need to be swapping yours.

Either way, the Blue Pure 411 Auto air purifier isn't an appliance that guzzles energy. Maintenance is super easy, too; the fabric pre-filter can be vacuumed and machine washed.