4 or 4.5 quarts. Check out the user manual to double check - http://new.volvocars.com/ownersdocs/1986/1986_240/86240_00.htm#contents
well compare them after you take them out becaue sometimes they have different connections and if they do then you have to switch the plugs to make them fit.
The service on light is pre programmed to switch on at pre-determined intervals to rmind you to take it in for maintenance.
15 Qts.
It should take about 7.5 Quarts
Mattews Volvo site has instructions and pictures on how its done.
As much as it takes to get withinthe "operating range" on the dipstick
5 quarts.
it depends on how much gas you got if its empty empty it should take up at least 18-19 gal.
20,000 pounds give or take some depending on fuel
Depends on where the leak is and how much you are willing to spend. Best thing is to take it to a reputable shop and get a written estimate on what needs to be fixed.
About 14 gallons
Most of the 91 volvo's airbags were not standard. However you can take it to any volvo dealership and have them add if you do not already have them.