Smoke from 2003 Boxster S at 95k

[NTZ]

I have a 2003 Boxster S at 95K miles that started to make some white smoke at starting the engine. That happened about once a week. The smoke was a lot. The oil separator was changed and that looked like resolved the problem but after about a 1000 miles of light use of the car the problem reappeared. About once a week, the engine makes some (not much but still visible smoke) when I start the engine. That happens regardless the car was idle for one night or for 1 hour. No smoke few seconds after start.
What most likely is the problem?
Thank you.

[ronster]

I could be wrong (and most likely am) but white smoke is sometimes caused by coolant in the combustion chamber.

[feelyx]

Most likely condensation in the exhaust pipe, from going hot to cold to hot again. Just plain ol'water vapor.

[Wayne 962]

Does it smell odd? Coolant in the exhaust will have a sweet smell and it will not smell like normal car exhaust. Coolant mix into the exhaust would probably be consistent (smoke every time) if there were a problem. How's your coolant level, is it decreasing over time? It should be pretty constant.

-Wayne

[NTZ]

Thank you all.
I don't know what is the smell of the smoke. I'll check it out next time.
There is a small crack in the coolant reservoir. There is a loss of coolant but so minimal that it is hard to detect. I wonder how could the leaking coolant makes it way in the exhaust or the combustion chamber?
My driving pattern is to drive for up to 4 miles and park and back again. I wonder whether this can contribute to the issue (possible condensation).
Also, there is some loss of hydraulic oil from the line. Some drops go over the exhaust but I thought that this cannot cause the brief smoke at start of the engine.
The suggestion to see what the smell looks like will probably help to figure the issue. I'll be on a look for it.
I appreciate your feedback.