Q: Sludge in engine, constantly low on oil

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I know I have a sludge problem because changed oil added recommend 6 quarts to engine. Checked oil level over course of 24 hours and I have a dry dipstick. No oil leaks. So I added seafoam to oil drove 100 miles. Changed oil and added 6 quarts oil waited hour checked oil still dry dipstick. Only a little bit of sludge on tip of dipstick. I don't want to add more oil it only should take 6 quarts. Oil pressure at idle is 30 and when driving around the block it went up to 40 when gas applied thend back to 30 seems low. What's should I do? I owe lots of $ still on it. Is it safe to drive?

My car has 173000 miles.
My car has an automatic transmission.

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