Original owner here with over 200,000 very enthusiastically driven miles on my IS300.
Still runs and looks great.
Only unscheduled maintainence was swapping out all of the O2 sensors at about 120K.
Bought Denso universals for about $60 ea and soldered them in myself.
Did clutch at 100K with aftermarket parts and saved $$$ vs. OEM parts.
Aftermarket clutch and flywheel holding up much longer than original, which started to slip a bit at 90K miles.
Lots of great aftermarket support for this popular car due to its great driving dynamics, good looks, and wonderful inline 6 motor.
Highly, highly recommended.
Great driver's car, especially with the manual trans.
Steering feel is not overboosted and handling is sublime.
Motor sounds great and makes smooth tractable power everywhere.
Chrome shift ball looks great, but gets super hot in summer and ice cold in winter.
Give me a nice leather knob instead.