Oil Pressure
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2000 Lexus SC 400, 2000 Lexus LS 400, 2000 Lexus GS 400, 1999 Lexus SC 400, and 1999 Lexus LS 400. However, it is still accessible from the selected car via links, so may be relevant.
With engine at normal operating temperature, oil pressure should be at least 4.2 psi (0.3 kg/cm2 ) at idle, and 43-85 psi (3.0-6.0 kg/cm2 ) at 3000 RPM.