2000 lexus rx300 smokes only at cold start up for one minute

[Jbf]

rx300 smokes blue smoke for one minute or less only on cold startup. runs great idles great

[RX400h]

Typically worn valves are the most common cause of blue smoke.

[jcjcrespo]

More specifically,  worn valve SEALS/GUIDES are the cause of cold start blue smoke

[Ed Fenwick]

I agree, blue smoke is oil. Unless it is heavy smoke, you may be able to use an additive to help the seals. Otherwise, let it warm up.

God bless   Ed