I must change the engine oil but have no ideea about what type of oil should I get because it`s the first oil change since I bought the car.
I know that most of you have Gasoline Audi`s but I`ve got a TDI ( 2.5L TDI 180HP quattro, it`s v6 diesel ) but any suggestion would help.

Someone told me that I should get Castrol ( known in US ) or ARAL ( I think it`s available only in Europe from where I am ).
So the guy where I`ll get the oil from made a check over his stock and recommended me Castrol SLX Longlife II 0W-30.
I`m unsure about this one because someone else told me that whatever oil make I get it must be a 5W-40.

Hope someone will help and give me 100% sure answer on what should I get.