9-5 3.0 TiD is “sick”

Hello municipality! With my 3 liter diesel the check engine control light lit up the other day. Not further tragic, then was only a “wire problem”, which also did not cost too much. However, it was then determined with a engine check that the engine is “sick”. (That meant the workshop master ). On more precise demand (you must know after all, with which virus one has to deal with it) was then announced that the compression, which in a new car approx. 30 bar, with a vehicle with almost 200 000 km but still at least 25 bar should be, now only 20 bar. Can that be? Is that possible? Shouldn’t one somehow notice something about the performance or something like that? Or are these really the signs of a change engine? At the same time, the SAAB action was also proposed to me, whereby I would still get 18500,- € for the 3.0 TiD if I would buy a new SAAB for it. Do everything or really What do you think?