My TDI used to be on variable servicing every 32000miles. But not that I drive a lot less (I don't drive to work and back 100 miles a day anymore) it has gone back to a 10000mile interval service. Thus at the last service my local Audi independent said he put normal oil in... Is this correct? What do I top it up with now? Can long-life SLX mix with normal oil? And what is the normal oil I need to get?