My bike has the same symptoms. Sight glass was milky all spring. Cleared up over the summer. Now it is milky again. Two oil changes showed no signs of contamination. So I no longer give it much worry. Unfortunately the condition makes the sight glass useless.

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My Glee has the same symptons nothing to worry about at all as previously said its condensation it will clear itself after a good run, my 2008 wee did it as well.

Thanks for the info, guys. I am no longer in panic mode though I'll probably still have a mechanic look at it. A theoretical question though. My previous bike, a Suzuki cruiser, never had this issue, and I rode that through all sorts of foul weather too. My wife's Gladius, which has pretty much the same engine as the 2012 Vstrom, does not have this problem (although it doesn't see as much use as mine). So why would one bike have water condensation, while another similar one does not?

Nothing to worry about. Condensation accumulate after too much short trips.
I saw this often in oil filler cap of car engines when i worked in a service station.

I'm wondering if you may have had some contamination in the oil that was lying around.

An easy test would be draining (and retaining) the oil and changing the filter. You may need it later if there are head gasket leaks, etc in the motor.

I've always heard that running water in the oil is not all that good for the motor.

This subject has me wondering. The 2012 has the oil to water cooler for engine oil. The 2004-2011 models had oil to air engine oil coolers.

I don't recall this much attention to having condensation in the oil on previous generation Wees...or Vees for that matter.

Could the new oil cooler be a bit too efficient at keeping oil temps down on shorter runs? I would imagine it has a thermostat, but maybe there is a small bypass? I'll try to think to look at the shop manual to see what I can find. If there is condensation in the oil, it is not getting hot enough to evaporate it out. Small amounts are not a problem but I wouldn't like it either.

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interesting theory, the oil temp has to be above 212° before it even starts to evap the moisture out

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100 deg C boils water, below that its evaporation.

It say's it here: Evaporation - Wikipedia, the free encyclopedia so it must be true.

It takes a long time for oil to warm up compared to the coolant. Certainly for short trips the liquid based oil cooler allows the oil to get up to operating temperature much faster than air cooled oil coolers, as the heat from the coolant warms the oil. Once the oil has gone beyond a certain temperature then the heat from the oil flows into the coolant. In cars I'm familiar with that have liquid based oil coolers the oil temperature gets up to 110c or 230f and stays there. I'm sure that the oil takes way longer to warm up with air based oil cooler.

..Tom

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He was talking farenheit so , 212 Degree F = 100 degree C