Gentlemen i also found while out on a call for a plugged pcv system due to moisture...i cleaned the pcv hoses and valve with brake clean and allowed to air dry also blowing out the top of the engine (under the Valve cover) before draining the engine oil on a pm service the moisture failed come back once cleaned process took about an hour and no issues since going to a 6 month pm cycle and insisting that the operator run unit for at least 20 minutes at a time....from a tech in michigan.......

I would have to agree with mike_n, the man from up north, especially when it comes to block heaters..

Put in a block heater, and keep it plugged in.
If the engine is warmer that the air, there can be no condensation formed.

This is what is done with stationary engines, like gensets. It works...

You may want to check the PCV valve/hoses to make sure they are ok.

I agree with Ed and John. Komatsu even published a Technical Bulletin on this subject

the milky oil look is a result of condensation from humid air entering the engines crankcase. Ed T is correct is teh ngien needs to operate a normal temperature fro a period of tiem for teh consation will evaporate. If you don't, sludge and acids will develop in the engine and errode bearings etc

the milky oil is a result of your not running the machine long enough when you do run it. run it a half hour each month, or an hour every other month even if you are just running up and down the block. your oil will -look- fine.
you should be aware there is a buildup in the oil of corrosive materials that do not get "burned" out, so changing the oil every so often (?6 months?) is still a very good idea, even if it "looks" clean.
I am told the high dollar synthetic oils resist getting milky better than the low cost generic oils, but I could not swear to that at all.