JohnBrowning is totally correct. Group III should not cost more than 2 -2.5 dollars/quart. Castrol can go to hell with their marketing strategy (i.e. screwing castormers). Their additive pack is not better than Mobil 1. In fact, my personal opinion is that Mobil 1 has the best addtive pack among all synthetic oil on the US market (and very likely world wide). Besides Castrol is not releasing any data sheets on their oils. How can I trust a company which is not giving info about their product, while everyone else does? How would you like to buy a car without knowing how many cylinders, power, speeds, and etc. it has?
I was thinking about using Castrol's highly praised German imported 0W-30, but now I think I'll stick with Mobil's 10W-30.
Regards,