Valve stem seals?

[tsoob]

When i am engine braking down hills itere a puffs of white somke coming out my exhaust any thoughts?

[MRDRFT]

valve stem seals normaly blow smoke at start up or if you idle 4 a long time then take off,i dont have any in my car and i have never had a problem on the hills

[Dell'Orto]

White smoke is usually oil burning without going through the combustion process, so maybe an oil seal on the turbo? How much white smoke are we talking?

[rollaholic]

i tend to associate white smoke with water personally!

(though i suppose it should more rightly be called steam)

[cat007]

I thought blue smoke was oil being burnt in the combustion chamber and white was oil burnt after the combustion chamber, such as a turbo ring/seal gone etc?

[tsoob]

not a huge ammount of smoke white smoke tho when i come on to vac when going down the motorway earlier today and sam said he saw it wehn he followed me tonight.