i've taken my cars to the track on a few occasions and i drive it hard regularly also. from my experience my engine also performed at its best when i had either castrol syntec(the german version) or motul 300v. other brands i've used also are mobil 1, amsoil, and royal purple. while all of them are pretty good one of my previous engines had a bad case of lifter tick and also had a slight knock to it. out of all the oils castrol and motul relieved the problems completely.