im using 5w/30 but i read thats not good
this one:
http://www.castrol.com/castrol/productdetailmin.do?categoryId=9014072&contentId=7027058
and they recommend this for 2l turbo forester :
Magnatec 5W-30 A1
this one:
http://www.castrol.com/castrol/productdetailmin.do?categoryId=9014072&contentId=7027058
and they recommend this for 2l turbo forester :
Magnatec 5W-30 A1