tapping/ticking noise

[anthony25]

my vauxhall vectra starts to make a tapping noise when its ticking over for around 5 mins, but goes as soon as i drive off but when i pull over and let it tick over 5 mins it comes back and if i wind the passenger window down it sounds as if it its under the wing or summat its a vectra sri 2000 model 2.0 engine...any pointers ppl??

[Nemesis9]

Check your oil level!