Well, even though fuels degrade with the years, there should be no major issue burning that fuel if the water contamination is not too high...

Once I saw a guy start an old Caterpillar bulldozer that had 15+ years sitting. He just got there, installed a new electric stater (the thing had a little gas engine as a starter) with jumper cables connected to a pair of huge batteries, primed the IP, sprayed some starting fluid in the intake, and after a 30 sec glow cycle, he fired if...

The things started without a hassle. At the beginning there was some blue smoke, maybe stuck rings. But after 10 mins or so, there was no smoke and the things was running perfectly...

Please note he just got there and started it. No fresh fuel or oils added to the dozer.

I know some might say this is because its a Cat, but come on, Volvo are one hell of a piece of engineering as well...

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1982 W123 300D NA Euro, 300K Miles, 4-speed manual, 3.46 rear diff, early W126 front brakes, Penta rims with 205/60R15 FH900's, custom fitted (by me) audio system, more to come into the money pit... Soon to be installed: Bilstein HD, R107 front discs and 4-piston calipers, HD Suspension springs, wagon front swaybar.