have used amsoil for 20 plus years. Have done the test with multiple oils with a sheet of metal and a torch under to create a hot spot. once the metal has become cherry hot you pour the oil close to the spot and see which way the oil runs. Amsoil, mobil 1, redline all went towards the heat. all conventional oils ran from the heat. castrol syntec went towards the heat and burst into flames..... this is a very crude test....but the results are still interesting. for the money amsoil is a good value as is mobil 1. redline is the oil we have used in our track cars; but not necessarily worth the extra $$.