I am trying to figure out what oil I should run in the girls Jetta. Its the 2.5 SE model. Lots of state to state and in town driving and it sits outside in the Minnesota winters. Both Mobil 1 and Amsoil say to use the euro formula. One says use 5-40 the other 0-40. I plan to do 5k changes and using Mann filters. Thanks for the help.