Does the oil need to be drained to do an oil filter change?

I'm looking at the manual and it says to unscrew oil coolers lines, line towards oil pressure gauge, and oil feed line. Will this cause a huge mess?

I know this might sound stupid (be patient) but do all those lines need to be unscrewed or can I just change the filter without doing all that?

digi

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1984 300td euro turbo