1998 Mazda Millenia white smoke (not really steamy though)

i just bought a 1998 mazda millenia s with the miller cycle supercharge engine. i change all the fluids and everything looked normal but when it is first started and until it warms up good i get white smoke from the exhaust it happens when i play with the idle sometime too but go's away after driving for a good distance. but everyday the same thing. i checked all the fluids and levels everything is good im not losing coolant and the oil is not milky could it be cause it sat for a while and maybe the seals inside (valve seals) are dry rotted. please help im confused.