[hiccup]

After coolers are probably the most often neglected maintenance item on these engines, so understanding their maintenance history is imperative.

With that being said, they will not cause this problem without first causing much more noticeable problems such as difficulty getting on plane and reaching rated rpm while underway.

Reading you message I would say it could be between and including absolutely nothing through a major concern. It really depends on how much smoke we're talking about. A little wispy white smoke on a cold start is absolutely normal. Billowing white smoke is not. The difference between wispy and billowing is subjective, and without seeing it ourselves, it's impossible to say where yours lands.

The air preheaters are there for exactly this purpose and should be used any time the engines are cold and the air and/or water is cool (say below 60 degrees).

The most concerning cause of white smoke would be low compression. Low compression would have other symptoms though--sluggish acceleration and low max rpm, possibly high blow-by. Injectors that have been fed water at some point will also cause white smoke.