Thanks for all the replys.
Finaly ordered " Castrol Magnatec 10-40 ".
Interessant article about " Multi-Viscosity Lubricants " on the link.
AutoMotiveu.com
Note:
I made my order on a shop in Germany ( this morning). The
oil willbe here mid next week. Reason for order in Germany is the price difference . Price in Spain for 10lt is 96€. In Germany for 20 lt inkl. delevery with DHL to Spain 110.50€ !!!!!!!