our 2NZ-FE vios uses STP every oil changed up to now 137,870km on odometer, engine power still the same, our corolla 2E with 494,160 km uses STP since 1995 till now 2 times overhaul conrod bearing, main bearing, camshaft ,crankshaft, rocker arm, engine block, etc. are still original 1995, only piston ring replaced.