************ I already posted this message in the (from 2001) forum, but lack of answers I try it again here, because I think there are still a few more with Audi-TDI engine. Thanks! ************ Hello people, with my V70 2.5D (EZ 10/2000) there is an urgent oil change. But I would like to bring my own oil to the workshop and am now a bit confused what kind of oil I should buy. Unfortunately my operating instructions are in Italian (re-import) and on the volvo website is the oldest guide for the model ’04, where no Audi engine is listed anymore. Therefore I can not find the right information. Of course I want to use a brand oil (e.g. Castrol) . On the website of Castrol Germany several possible oil types are listed. 1. Castrol MAGNATEC 5W-30 C3 2. Castrol MAGNATEC Diesel 5W-40 B4 3. Castrol Turbo 5W-40 The edge line of Castrol is fully characterized by the oil manufacturer? What is the difference between 5W and 40?