So what would people say about a castrol Formula R Synthetic 10W60 oil? the description from castrols website reads like this:
"Recommended for highly stressed competition engines and older technology sports cars and luxury sedans. The wider 10W60 viscosity range ensures maximum protection under a wide range of driving conditions and high stress applications. Exceptional thermal stability helps provide cleaner running engines. Helps extend the life of your engine through maintaining high film thickness and good oil pressure at high temperatures. Suitable for the hottest and coldest climates. Exceptional turbo-charged engine performance."
Of course all that's an advertising gimmick but some of it has to be true. There is also a 5W-30 oil