After 75 laps with newly installed AMSOIL “Racing” oil Product Code ARO this 911 machine enjoyed a 35 degree drop in oil temperature. This is not uncommon, actual drop depends on the air flow and component location.  Essence of which AMSOIL will transfer heat better than other oils  thereby permitting more power to the wheels or where needed. Metals benefit as the heat cycles are lessened.  I have been running exact same oil in my 1967 MGB roadster for more than two decades.  This product still available yet is no longer offered as a racing oil, our line of race oils is considerable now——please examine the Website.