These cars when run on bangernomics principles will do galactic miles. £500 eh? And my £500 says you're not drivng any finance agreement, it's yours, outright. Good for you. That's my kind of language.
This is for the P80 cars, but much of it applies to later cars too.
eg: More so if you've an auto, flush the box very soon. Watch the PCV! If you've the nerve, the bare-faced cheek, the impertinence to run a car forever for minimal cost whilst others, for reasons of vanity, persist in suppporting those needy souls, the motor-trade, the banks and the finance companies, this is for you:
https://www.volvoforums.org.uk/showthread.php?t=263883