I had been using Mobil 1 for awhile, switched to amsoil this past oil change. Im now thinking of using redline 5w-40 since Ill be doing a couple HPDEs and all the autox's this year. Is it really worth the extra money? I know guys have had good results with PP, but 99% of them do not track their car hard. Just looking to get your input, amsoil and redline run about the same price wise. The car has 35k on it, so Im concerned with protection. I havent done any oil tests in the past.