I was wondering what the shelf life of German GC is? I found a large quanity of the German stuff at AutoZone in Idaho, seems to be more then 10 cases and about 20 bottles on the dispaly shelf! I would like to run this oil in my O5 Subaru 2.5L turbo Outback, it calls for 5W30; would this oil be a good match? Idaho has hot summers--daily temps are at or past 100 degrees. The price for a case is $26.55! Thanks to those that reply!