After running an engine with extended high temperature exposure...I decided to dump the GC 0W30 in favor of Royal Purple 5W30. What are your thoughts on RP?? I have a sample of the GC 0W30 to send into Blackstone, but wanted to wait until payday to send it off. I am curious to see what 20-30 mins of prolonged exposure to high engine temp's will do to the results??