Our previous track experience indicated strongly that a better oil pan was needed for the 1MZ. Although we installed an oil pressure accumulator our first engine still barely lased an hour and the second about 10 minutes. The 1MZ features a very poor pan design for performance driving. The pan is very shallow and wide. The oil depth when the engine is full is only around 2″ above the bottom of the pan! It is no surprise that this causes issues!