oil smoke on start up.

[Paul99]

My 230 had a head rebuild 2k miles ago but I notice some smoke on start up and each start up.  Blue smoke.  After a few se s its fine and driving hard down to le mans 24 hour recently it used only about half a pint for 900 miles.  I think k it might be the valve guide seals ??  Thoughts. ?? 

[tel76]

My first thought is who did the work on the cylinder head ?

[Paul99]

It was rees brothers in Farnborough.  The head was cracked and needed a full rebuild and pressure test. 

[garymand]

Take it back over to them and have them check it out.  there aren't many ways for oil to get in there: blow by from the valve cover to the intake,  vlave guides, valve seals, a crack to an oil passage.  The first would not likely give you a startup smoke and the last is way remote.  If its guide / seals, put the top down do 70 on the freeway and coast down to maybe 50 on an offramp.  That sucks oil down the guides into the valves.  Then accelerate quickly.  You would see a puff of blue smoke from the oil in the intake.  You might have some one following to see it.