You've never heard of Red Line Oils? What rock are you living under
Read the spec sheet OneJ posted in the 1st post. Red Line is an ester based Grp V oil, GC is a PAO based Grp IV oil...different base stock, but both are true synthetics. Ester is probably the best base stock out there, but it is expensive and way over kill for an automotive engine IMO. If you want the best though, Red Line is it.
The 0W-40 talked about in this thread is a bit thick for a daily driver, but will work fine. As far a providing additional "protection", OneJ is referring to higher demands you can see at the track causing oil to thin at temps over 100 deg C. Every motor oil on the market will decrease in viscosity as temp increases...the grade is spec'ed at 100 deg C. Over that, viscosity continues to decrease.
A better solution is to use a larger oil cooler to keep the oil temps at the specified 100 deg C. A thicker oil is not going to flow as well at engine start, even during the summer.
Personally, I'm sticking with GC.