Vanagon : Syncro : Kombi : Microbus : Caravelle : Transporter : Doka : Westfalia
How long has it been sitting? Hard to tell from the video, but it almost sounds like the lifters have bled down. Also sounds a bit like the cat may have gone bad. I'm hearing a bit of a rattling??
Does it every morning, only sitting for about 12 hours max. Re: the cat, there is another noise, but can not pinpoint it, and the video does not accurately convey the sounds.
Check your alternator and everything else with a hillbilly stethoscope 1/2" wooden dowel, WATCH FOR BELTS! Sounds like mine did when the alternator bearings were on their death bed. It still managed to charge the battery without fault, but the bearings were shot.