I just ordered some Amsoil 10w-30 and received some series 2000 20w-50 racing oil instead. I guess I shouldn't complain much, but I really don't have an application for such a heavy oil. Could I use this as a passenger car oil? It looks pretty thin at room temp, is it closer to a 10w-50? I wanted the 10w-30 to run in my truck (F150 with 4.2L V6) for the rest of the year. 20w-50 would be way to heavy for the cooler months right? What about the add package? I imagine that since its a race oil, the TBN and wear adds are low, but its packed with friction modifiers. BTW _ I called Amsoil customer service and the woman on the phone was very rude and not very helpful. I hope this is not gonna be a trend.