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It sounds like a possible rattle from a hydraulic tappet. If the engine hasn’t been run for 4 years the tappets, or at least some of them, will likely of lost oil. If your oil light goes out on starting the engine and you’ve done a change with the recommended oil, it’s sometimes an idea to rev the engine for a few minutes, then idle again to see if it quietens them down. You can repeat this process a few times. Just letting it idle may not quieten them down. I’ve just bought a new set of INA tappets for my MK2 polo and the recommendation is run the engine for 4 minutes at 2 to 3K revs,then 30 seconds rest and seeing if they quieten down, if not repeating the process for a further 4 minutes. If that doesn’t work do it for 6 then 7 then 8 then 9 minutes, with a 30 second rests in between, in total 5 attempts to stop the rattle. If that doesn’t sort it then you may have a faulty hydraulic tappet/camshaft or an oil pressure issue. As I say this is the recommended procedure for NEW tappets, but it might do the trick, especially as your engine has been stood for so long. I emphasise you must ensure your oil warning light goes out before trying this.