Personally I would change oil, filter and coolant, then give it a good long
but easy run.  Then change them again.  You don't know what is in the oil
now, or if the filter is ok.  I would also get new air and fuel filters.

Paul

Change it, drive it fast for an hour or two, then pour a liter/quart of ATF
in the oil, drive easy for 1/2 hour and have it changed while it's very
warm.

I used to stick my finger in the oil fill hole, and reach around--if there
was a 'lot' of gunk I would remove the valve cover and clean out as much
gunk, including digging out any gunk in the oil galleries that I could
reach, and if they were badly gunked up I would use a wire hanger and press
down in there to get as much gunk either pulled up (better) or pushed down
( danger will Robinson!)  Pressing gunk down risks clogging up the gallery,
try not to do that if there is heavy gunk.

I seized a engine using 'motor flush' since then--mid 70's--I now use
transmission fluid to do the job--loosen up gunk--***BUT** in beat engines
the gunk in the bearings etc is critical--wash it away and you might have a
very noisy engine...

So my advice is do the finger test, also look on the dip stick--it should
not be much discolored along it's length--obviously there will be some, but
if it's all black where the dipstick is covered by oil you have a badly
maintained car--Most Volvos in the USA will pass these tests more or
less--my experience is from years of driving $200 American cars as a kid.

I would have thought that it was a 940 if it was '97 registration. Surely
you mean an '87 reg.

Cheers, Peter.