I see they have a sale on at Halfords £10 for 4 litres of 5W30 fully synthetic but it's not the Vag specific stuff it's for Vauxhaul, Ford , Saab do people think it would be ok to run our TDi on it ?? i mean as long as you do regular oil changes it can't make that much difference can it that it's not VAG spec..... it's only a standard 1.9 TDi it's not like it's some fire spitting monster what are peoples thoughts ??