VVTi Cam Gear Oil Leak Gear Rebuild Lexus IS300 Toyota Altezza

You doing all that at your own risk, if you don't want to rebuild VVt-i no problem by new VVT-i for about 140$-200$ or more.
VVT-i Cam Gear Rebuild was successful but this vehicle requires all timing belt components replacement, because of oil wich came from faulty VVT-i O-ring.