2002 ES300 Smokes

[JADV]

2002 ES300  175,000 miles  Has problem with intermittent exhaust smoke at start up.  Not always, mostly after highway driving.  Uses 1 quart of oil between 3,000 mile oil changes

[MechanicalMariner]

Have you checked your spark plug tubes for oil? Sometimes the gaskets keeping oil from getting into the tubes will crack and then overfill. Right beneath the tubes are your exhaust pipes. You may be leaking oil from the tubes out and onto the pipes (resulting in your smoke scenario). Regardless, it probably wouldn't hurt for you to remove your intake manifold so that you could look on the backside of your valve cover for any leaking oil.