I have conflicting advice as to whether i should be using synthetic or standard oil. please advise

USE 5W 30 COLD TEMPERATURES HOT TEMPERATURES USE 5W 40

VW group have TWO service regimes,annually/10k or extended ( when the service indicator shows when you need to service it).this is set when the dealer supplies the car NEW.it cannot be reset after.VW group products fit 5/30 fully synthetic when new and the type of oil for services is determined by the service type,I.E. annual/10k services, use 10/40 semi synthetic and for extended/20k services use 10/40 fully synthetic.check the oil every 500 miles as ALL VW will use oil.if you bought the car used, then, rather than use the service indicator, do an oil change EVERY year and use semi 10/40.if a dealer services the car the service indicator should be reset EVERY time.