UKPassats

Hi guys. My '06 B6 estate is creeping towards 109000 miles & is due it's service. I did it myself last year replacing the air, oil, fuel & cabin filters along with oil change & the usual lights/fluid levels check. After taking the advise from a V-Dub enthusiast colleague, I used the quantum PD oil last year but noticed that all the parts retailers were recommending/pushing the long life oil. I'm of the mind-set that PD oil is for a PD engine... Can anyone enlighten me as to which is better suited?
Ta in advance, the input's appreciated.