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they'll probably tell you it is normal. some cars do it, some cars don't. some cars do it when hot, some when cold. the aos lets a bit of oil through even when working properly, so a puf of smoke on startup should be ok (but not a smoke cloud). if the aos failed recently and was replaced, residual oil can cause a puff on start. maybe it isn't oil at all but rather condensation in the exhaust burning off? also note that these are horizontally-opposed engines, so the cylinders lay flat (as opposed to a 'v' type engine) and oil may seep into the combustion chamber if it sits long enough and smoke on start. if you think this is the case then perhaps ask for a compression or leakdown test as part of your pre-purchase inspection to make sure there is no scoring or cylinders going egg-shaped..
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