I think amsoil has one API certified oil the XL line- is this true? And also is this a group III oil? And how does the quality of the adds package and base oil compare to that of say castrol syntec, valvoline synpower, pennzoil synthetic, and others? I purchased a new dodge dakota with the 7 70 warranty and they are very upfront about only using API certified oils to follow the warranty. And yes I am listening to them but also want to use the best synthetic certified oil possible. I hope it is as good as Mobil SS. Seems mobil has trouble with high iron lately. Thanks for your replies.
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