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what did you do to the fuel system,, is it running rich? to much gas will give you a white smoke even after it is warmed up, you wont see it while driving
also, did you bypass your cat or gut your cat, a factory tune doesnt burn all the gas , normally the cat will catch the extra so you wont see it comeing out of the tail pipe.
is the back of you car getting little black spots
The only way that oil would be in the intake would be through the PCV.
Pull your intake mani, if there's oil in it, then it's the PCV, if it's clean, its your valve stem seals. While the intake mani is off, you can look at the valve stems to make sure.
You sure it's not just running rich?