has anybody used any gc oil in their trucks? from what i am hearing on the net that it is the best oil you can buy. you can only buy it at auto zone and it is ow-30 weight. it is diferent from the the other castrol on the shelf. it has to say made in germany on the back of the bottle. people are going crazy trying to find it. they are storing all they get their hands on because castrol don,t make it any more. they even have a forum only for gc oil on the site bobtheoilguy.