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if it has gone this long, another week won't be the difference between an immediate demise and a million mile life.... but $20 and 30 minutes every 5,000-7,500 miles(i'm guessing what a normal interval for your car might be, follow your manual/community knowledge) is a drop in the bucket compared to the time and money spent swapping an engine only to potentially do it again if a swapped engine led a neglected life as well.
new oil helps, but an ancient filter doesn't. if i had something that leaked/burned more than a quart every 1,000 miles, i don't think i would change the oil often, but the filter would certainly be getting attention.
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